30639222 has 40 divisors (see below), whose sum is σ = 70880832. Its totient is φ = 9882000.

The previous prime is 30639221. The next prime is 30639227. The reversal of 30639222 is 22293603.

30639222 is a `hidden beast` number, since 3 + 0 + 639 + 2 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30639221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1972 + ... + 8072.

Almost surely, 2^30639222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30639222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35440416).

30639222 is an abundant number, since it is smaller than the sum of its proper divisors (40241610).

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

30639222 is a wasteful number, since it uses less digits than its factorization.

30639222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6146 (or 6137 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 30639222 is about 5535.2707250865. The cubic root of 30639222 is about 312.9146606310.

The spelling of 30639222 in words is "thirty million, six hundred thirty-nine thousand, two hundred twenty-two".