1397639744 has 14 divisors (see below), whose sum is σ = 2773441494. Its totient is φ = 698819840.

The previous prime is 1397639657. The next prime is 1397639777. The reversal of 1397639744 is 4479367931.

It can be written as a sum of positive squares in only one way, i.e., 766625344 + 631014400 = 27688^2 + 25120^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10918997 + ... + 10919124.

Almost surely, 2^1397639744 is an apocalyptic number.

It is an amenable number.

1397639744 is a deficient number, since it is larger than the sum of its proper divisors (1375801750).

1397639744 is an equidigital number, since it uses as much as digits as its factorization.

1397639744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21838133 (or 21838123 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 53.

The square root of 1397639744 is about 37385.0203156291. The cubic root of 1397639744 is about 1118.0599236317.

The spelling of 1397639744 in words is "one billion, three hundred ninety-seven million, six hundred thirty-nine thousand, seven hundred forty-four".