1997100636 has 48 divisors (see below), whose sum is σ = 4940520480. Its totient is φ = 625715200.

The previous prime is 1997100629. The next prime is 1997100661. The reversal of 1997100636 is 6360017991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158986 + ... + 171086.

It is an arithmetic number, because the mean of its divisors is an integer number (102927510).

Almost surely, 2^1997100636 is an apocalyptic number.

It is an amenable number.

1997100636 is an abundant number, since it is smaller than the sum of its proper divisors (2943419844).

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

1997100636 is a wasteful number, since it uses less digits than its factorization.

1997100636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12934 (or 12932 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 1997100636 is about 44688.9319183173. The cubic root of 1997100636 is about 1259.3119271661.

The spelling of 1997100636 in words is "one billion, nine hundred ninety-seven million, one hundred thousand, six hundred thirty-six".