1397078013 has 4 divisors (see below), whose sum is σ = 1862770688. Its totient is φ = 931385340.

The previous prime is 1397077991. The next prime is 1397078021. The reversal of 1397078013 is 3108707931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1397078013 - 2¹⁸ = 1396815869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397078063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232846333 + ... + 232846338.

It is an arithmetic number, because the mean of its divisors is an integer number (465692672).

Almost surely, 2^1397078013 is an apocalyptic number.

It is an amenable number.

1397078013 is a deficient number, since it is larger than the sum of its proper divisors (465692675).

1397078013 is an equidigital number, since it uses as much as digits as its factorization.

1397078013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465692674.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 1397078013 is about 37377.5067788102. The cubic root of 1397078013 is about 1117.9101155758.

The spelling of 1397078013 in words is "one billion, three hundred ninety-seven million, seventy-eight thousand, thirteen".