1396658537 has 4 divisors (see below), whose sum is σ = 1416329856. Its totient is φ = 1376987220.

The previous prime is 1396658507. The next prime is 1396658551. The reversal of 1396658537 is 7358566931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7358566931 = 349 ⋅21084719.

It is a cyclic number.

It is not a de Polignac number, because 1396658537 - 2⁸ = 1396658281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1396658507) 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 3 ways as a sum of consecutive naturals, for example, 9835553 + ... + 9835694.

It is an arithmetic number, because the mean of its divisors is an integer number (354082464).

Almost surely, 2^1396658537 is an apocalyptic number.

It is an amenable number.

1396658537 is a deficient number, since it is larger than the sum of its proper divisors (19671319).

1396658537 is an equidigital number, since it uses as much as digits as its factorization.

1396658537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19671318.

The product of its digits is 4082400, while the sum is 53.

The square root of 1396658537 is about 37371.8950148370. The cubic root of 1396658537 is about 1117.7982193180.

The spelling of 1396658537 in words is "one billion, three hundred ninety-six million, six hundred fifty-eight thousand, five hundred thirty-seven".