1397931 has 4 divisors (see below), whose sum is σ = 1863912. Its totient is φ = 931952.

The previous prime is 1397909. The next prime is 1397933.

1397931 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1397931 - 2¹¹ = 1395883 is a prime.

It is a super-2 number, since 2×1397931² = 3908422161522, which contains 22 as substring.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1397892 and 1397901.

It is not an unprimeable number, because it can be changed into a prime (1397933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232986 + ... + 232991.

It is an arithmetic number, because the mean of its divisors is an integer number (465978).

2^1397931 is an apocalyptic number.

1397931 is a deficient number, since it is larger than the sum of its proper divisors (465981).

1397931 is an equidigital number, since it uses as much as digits as its factorization.

1397931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465980.

The product of its digits is 5103, while the sum is 33.

The square root of 1397931 is about 1182.3413212774. The cubic root of 1397931 is about 111.8137582901.

The spelling of 1397931 in words is "one million, three hundred ninety-seven thousand, nine hundred thirty-one".