897939840 has 256 divisors, whose sum is σ = 3320663040. Its totient is φ = 202137600.

The previous prime is 897939839. The next prime is 897939851. The reversal of 897939840 is 48939798.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 953770 + ... + 954710.

It is an arithmetic number, because the mean of its divisors is an integer number (12971340).

Almost surely, 2^897939840 is an apocalyptic number.

897939840 is a gapful number since it is divisible by the number (80) 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 897939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660331520).

897939840 is an abundant number, since it is smaller than the sum of its proper divisors (2422723200).

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

897939840 is a wasteful number, since it uses less digits than its factorization.

897939840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041 (or 1029 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 57.

The square root of 897939840 is about 29965.6443281302. The cubic root of 897939840 is about 964.7521319232.

The spelling of 897939840 in words is "eight hundred ninety-seven million, nine hundred thirty-nine thousand, eight hundred forty".