1397831 has 4 divisors (see below), whose sum is σ = 1400472. Its totient is φ = 1395192.

The previous prime is 1397783. The next prime is 1397833. The reversal of 1397831 is 1387931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397831 is a prime.

It is a super-2 number, since 2×1397831² = 3907863009122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397833) 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, 221 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (350118).

2^1397831 is an apocalyptic number.

1397831 is a deficient number, since it is larger than the sum of its proper divisors (2641).

1397831 is an equidigital number, since it uses as much as digits as its factorization.

1397831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640.

The product of its digits is 4536, while the sum is 32.

The square root of 1397831 is about 1182.2990315483. The cubic root of 1397831 is about 111.8110920539.

The spelling of 1397831 in words is "one million, three hundred ninety-seven thousand, eight hundred thirty-one".