897985540 has 12 divisors (see below), whose sum is σ = 1885769676. Its totient is φ = 359194208.

The previous prime is 897985537. The next prime is 897985589. The reversal of 897985540 is 45589798.

It can be written as a sum of positive squares in 2 ways, for example, as 205979904 + 692005636 = 14352^2 + 26306^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22449619 + ... + 22449658.

It is an arithmetic number, because the mean of its divisors is an integer number (157147473).

Almost surely, 2^897985540 is an apocalyptic number.

It is an amenable number.

897985540 is an abundant number, since it is smaller than the sum of its proper divisors (987784136).

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

897985540 is a wasteful number, since it uses less digits than its factorization.

897985540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44899286 (or 44899284 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 55.

The square root of 897985540 is about 29966.4068583472. The cubic root of 897985540 is about 964.7684984333.

The spelling of 897985540 in words is "eight hundred ninety-seven million, nine hundred eighty-five thousand, five hundred forty".