30399072 has 72 divisors (see below), whose sum is σ = 87744888. Its totient is φ = 9208320.

The previous prime is 30399071. The next prime is 30399073. The reversal of 30399072 is 27099303.

It is an interprime number because it is at equal distance from previous prime (30399071) and next prime (30399073).

It is a super-2 number, since 2×30399072² = 1848207156922368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30399071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10308 + ... + 12924.

It is an arithmetic number, because the mean of its divisors is an integer number (1218679).

Almost surely, 2^30399072 is an apocalyptic number.

30399072 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30399072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43872444).

30399072 is an abundant number, since it is smaller than the sum of its proper divisors (57345816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30399072 is a wasteful number, since it uses less digits than its factorization.

30399072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652 (or 2633 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 33.

The square root of 30399072 is about 5513.5353449488. The cubic root of 30399072 is about 312.0949743737.

The spelling of 30399072 in words is "thirty million, three hundred ninety-nine thousand, seventy-two".