897236639 has 8 divisors (see below), whose sum is σ = 1017110640. Its totient is φ = 784627776.

The previous prime is 897236621. The next prime is 897236651. The reversal of 897236639 is 936632798.

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 897236639 - 2⁸ = 897236383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897236699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1816022 + ... + 1816515.

It is an arithmetic number, because the mean of its divisors is an integer number (127138830).

Almost surely, 2^897236639 is an apocalyptic number.

897236639 is a deficient number, since it is larger than the sum of its proper divisors (119874001).

897236639 is a wasteful number, since it uses less digits than its factorization.

897236639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632569.

The product of its digits is 2939328, while the sum is 53.

The square root of 897236639 is about 29953.9085763444. The cubic root of 897236639 is about 964.5002249818.

The spelling of 897236639 in words is "eight hundred ninety-seven million, two hundred thirty-six thousand, six hundred thirty-nine".