897974891 has 8 divisors (see below), whose sum is σ = 1002391104. Its totient is φ = 797355720.

The previous prime is 897974837. The next prime is 897974893. The reversal of 897974891 is 198479798.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 897974891 - 2²⁶ = 830866027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (897974893) 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 7 ways as a sum of consecutive naturals, for example, 948761 + ... + 949706.

It is an arithmetic number, because the mean of its divisors is an integer number (125298888).

Almost surely, 2^897974891 is an apocalyptic number.

897974891 is a deficient number, since it is larger than the sum of its proper divisors (104416213).

897974891 is a wasteful number, since it uses less digits than its factorization.

897974891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898521.

The product of its digits is 9144576, while the sum is 62.

The square root of 897974891 is about 29966.2291755236. The cubic root of 897974891 is about 964.7646847638.

The spelling of 897974891 in words is "eight hundred ninety-seven million, nine hundred seventy-four thousand, eight hundred ninety-one".