1397213937 has 48 divisors (see below), whose sum is σ = 2345466240. Its totient is φ = 785030400.

The previous prime is 1397213929. The next prime is 1397213953. The reversal of 1397213937 is 7393127931.

It is a happy number.

It is not a de Polignac number, because 1397213937 - 2³ = 1397213929 is a prime.

It is a super-4 number, since 4×1397213937⁴ (a number of 38 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1397213892 and 1397213901.

It is not an unprimeable number, because it can be changed into a prime (1397213957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1182487 + ... + 1183667.

It is an arithmetic number, because the mean of its divisors is an integer number (48863880).

Almost surely, 2^1397213937 is an apocalyptic number.

It is an amenable number.

1397213937 is a deficient number, since it is larger than the sum of its proper divisors (948252303).

1397213937 is a wasteful number, since it uses less digits than its factorization.

1397213937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494 (or 1491 counting only the distinct ones).

The product of its digits is 214326, while the sum is 45.

The square root of 1397213937 is about 37379.3249939054. The cubic root of 1397213937 is about 1117.9463688334.

The spelling of 1397213937 in words is "one billion, three hundred ninety-seven million, two hundred thirteen thousand, nine hundred thirty-seven".