1397915679 has 12 divisors (see below), whose sum is σ = 1872059784. Its totient is φ = 927863424.

The previous prime is 1397915677. The next prime is 1397915683. The reversal of 1397915679 is 9765197931.

It is not a de Polignac number, because 1397915679 - 2¹ = 1397915677 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397915677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1077159 + ... + 1078455.

It is an arithmetic number, because the mean of its divisors is an integer number (156004982).

Almost surely, 2^1397915679 is an apocalyptic number.

1397915679 is a deficient number, since it is larger than the sum of its proper divisors (474144105).

1397915679 is an frugal number, since it uses more digits than its factorization.

1397915679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874 (or 1577 counting only the distinct ones).

The product of its digits is 3214890, while the sum is 57.

The square root of 1397915679 is about 37388.7105822065. The cubic root of 1397915679 is about 1118.1334980430.

The spelling of 1397915679 in words is "one billion, three hundred ninety-seven million, nine hundred fifteen thousand, six hundred seventy-nine".