1397479797 has 40 divisors (see below), whose sum is σ = 2397333312. Its totient is φ = 794707200.

The previous prime is 1397479771. The next prime is 1397479799. The reversal of 1397479797 is 7979747931.

1397479797 is a `hidden beast` number, since 1 + 3 + 97 + 479 + 79 + 7 = 666.

It is not a de Polignac number, because 1397479797 - 2⁷ = 1397479669 is a prime.

It is a super-2 number, since 2×1397479797² = 3905899566046322418, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397479799) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 113797 + ... + 125477.

Almost surely, 2^1397479797 is an apocalyptic number.

It is an amenable number.

1397479797 is a deficient number, since it is larger than the sum of its proper divisors (999853515).

1397479797 is a wasteful number, since it uses less digits than its factorization.

1397479797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11911 (or 11902 counting only the distinct ones).

The product of its digits is 21003948, while the sum is 63.

The square root of 1397479797 is about 37382.8810687459. The cubic root of 1397479797 is about 1118.0172714500.

The spelling of 1397479797 in words is "one billion, three hundred ninety-seven million, four hundred seventy-nine thousand, seven hundred ninety-seven".