30921396 has 48 divisors (see below), whose sum is σ = 79036608. Its totient is φ = 9331200.

The previous prime is 30921391. The next prime is 30921427. The reversal of 30921396 is 69312903.

It is a super-2 number, since 2×30921396² = 1912265461177632, which contains 22 as substring.

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 (30921391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56886 + ... + 57426.

It is an arithmetic number, because the mean of its divisors is an integer number (1646596).

Almost surely, 2^30921396 is an apocalyptic number.

It is an amenable number.

30921396 is an abundant number, since it is smaller than the sum of its proper divisors (48115212).

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

30921396 is a wasteful number, since it uses less digits than its factorization.

30921396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 30921396 is about 5560.7010349415. The cubic root of 30921396 is about 313.8723296677.

The spelling of 30921396 in words is "thirty million, nine hundred twenty-one thousand, three hundred ninety-six".