897139992 has 32 divisors (see below), whose sum is σ = 2563257600. Its totient is φ = 256325664.

The previous prime is 897139987. The next prime is 897140009. The reversal of 897139992 is 299931798.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2669892 + ... + 2670227.

It is an arithmetic number, because the mean of its divisors is an integer number (80101800).

Almost surely, 2^897139992 is an apocalyptic number.

It is an amenable number.

897139992 is an abundant number, since it is smaller than the sum of its proper divisors (1666117608).

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

897139992 is a wasteful number, since it uses less digits than its factorization.

897139992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5340135 (or 5340131 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 57.

The square root of 897139992 is about 29952.2952709805. The cubic root of 897139992 is about 964.4655929437.

The spelling of 897139992 in words is "eight hundred ninety-seven million, one hundred thirty-nine thousand, nine hundred ninety-two".