897939920 has 20 divisors (see below), whose sum is σ = 2087710500. Its totient is φ = 359175936.

The previous prime is 897939919. The next prime is 897939937. The reversal of 897939920 is 29939798.

897939920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 228372544 + 669567376 = 15112^2 + 25876^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5612045 + ... + 5612204.

It is an arithmetic number, because the mean of its divisors is an integer number (104385525).

Almost surely, 2^897939920 is an apocalyptic number.

897939920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

897939920 is an abundant number, since it is smaller than the sum of its proper divisors (1189770580).

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

897939920 is a wasteful number, since it uses less digits than its factorization.

897939920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11224262 (or 11224256 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 56.

The square root of 897939920 is about 29965.6456629921. The cubic root of 897939920 is about 964.7521605740.

The spelling of 897939920 in words is "eight hundred ninety-seven million, nine hundred thirty-nine thousand, nine hundred twenty".