30492840 has 128 divisors (see below), whose sum is σ = 108011520. Its totient is φ = 6739200.

The previous prime is 30492821. The next prime is 30492851. The reversal of 30492840 is 4829403.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 30492798 and 30492807.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25455 + ... + 26625.

It is an arithmetic number, because the mean of its divisors is an integer number (843840).

Almost surely, 2^30492840 is an apocalyptic number.

30492840 is a gapful number since it is divisible by the number (30) 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 30492840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54005760).

30492840 is an abundant number, since it is smaller than the sum of its proper divisors (77518680).

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

30492840 is a wasteful number, since it uses less digits than its factorization.

30492840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 30492840 is about 5522.0322346035. The cubic root of 30492840 is about 312.4155377070.

The spelling of 30492840 in words is "thirty million, four hundred ninety-two thousand, eight hundred forty".