1397687636 has 6 divisors (see below), whose sum is σ = 2445953370. Its totient is φ = 698843816.

The previous prime is 1397687527. The next prime is 1397687651. The reversal of 1397687636 is 6367867931.

It can be written as a sum of positive squares in only one way, i.e., 1217591236 + 180096400 = 34894^2 + 13420^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174710951 + ... + 174710958.

It is an arithmetic number, because the mean of its divisors is an integer number (407658895).

Almost surely, 2^1397687636 is an apocalyptic number.

It is an amenable number.

1397687636 is a deficient number, since it is larger than the sum of its proper divisors (1048265734).

1397687636 is a wasteful number, since it uses less digits than its factorization.

1397687636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349421913 (or 349421911 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 56.

The square root of 1397687636 is about 37385.6608340685. The cubic root of 1397687636 is about 1118.0726940933.

The spelling of 1397687636 in words is "one billion, three hundred ninety-seven million, six hundred eighty-seven thousand, six hundred thirty-six".