897431787 has 24 divisors (see below), whose sum is σ = 1482455520. Its totient is φ = 512478720.

The previous prime is 897431783. The next prime is 897431797. The reversal of 897431787 is 787134798.

It is not a de Polignac number, because 897431787 - 2² = 897431783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (897431783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115237 + ... + 122777.

It is an arithmetic number, because the mean of its divisors is an integer number (61768980).

Almost surely, 2^897431787 is an apocalyptic number.

897431787 is a deficient number, since it is larger than the sum of its proper divisors (585023733).

897431787 is a wasteful number, since it uses less digits than its factorization.

897431787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9443 (or 9440 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 897431787 is about 29957.1658706227. The cubic root of 897431787 is about 964.5701458319.

The spelling of 897431787 in words is "eight hundred ninety-seven million, four hundred thirty-one thousand, seven hundred eighty-seven".