30997120 has 256 divisors, whose sum is σ = 100465920. Its totient is φ = 8847360.

The previous prime is 30997079. The next prime is 30997121. The reversal of 30997120 is 2179903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30997121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 837742 + ... + 837778.

It is an arithmetic number, because the mean of its divisors is an integer number (392445).

Almost surely, 2^30997120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30997120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50232960).

30997120 is an abundant number, since it is smaller than the sum of its proper divisors (69468800).

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

30997120 is a wasteful number, since it uses less digits than its factorization.

30997120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 30997120 is about 5567.5057251879. The cubic root of 30997120 is about 314.1283367913.

The spelling of 30997120 in words is "thirty million, nine hundred ninety-seven thousand, one hundred twenty".