997638586 has 64 divisors (see below), whose sum is σ = 1849881600. Its totient is φ = 394056576.

The previous prime is 997638583. The next prime is 997638613. The reversal of 997638586 is 685836799.

It is not an unprimeable number, because it can be changed into a prime (997638583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1611385 + ... + 1612003.

It is an arithmetic number, because the mean of its divisors is an integer number (28904400).

Almost surely, 2^997638586 is an apocalyptic number.

997638586 is a deficient number, since it is larger than the sum of its proper divisors (852243014).

997638586 is a wasteful number, since it uses less digits than its factorization.

997638586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803.

The product of its digits is 19595520, while the sum is 61.

The square root of 997638586 is about 31585.4172997603. The cubic root of 997638586 is about 999.2122415997.

The spelling of 997638586 in words is "nine hundred ninety-seven million, six hundred thirty-eight thousand, five hundred eighty-six".