1397631 has 8 divisors (see below), whose sum is σ = 1870000. Its totient is φ = 928512.

The previous prime is 1397609. The next prime is 1397633. The reversal of 1397631 is 1367931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1397631 - 2⁹ = 1397119 is a prime.

It is a super-2 number, since 2×1397631² = 3906744824322, 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 (1397633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495 + ... + 1743.

It is an arithmetic number, because the mean of its divisors is an integer number (233750).

2^1397631 is an apocalyptic number.

1397631 is a deficient number, since it is larger than the sum of its proper divisors (472369).

1397631 is a wasteful number, since it uses less digits than its factorization.

1397631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625.

The product of its digits is 3402, while the sum is 30.

The square root of 1397631 is about 1182.2144475517. The cubic root of 1397631 is about 111.8057592002.

The spelling of 1397631 in words is "one million, three hundred ninety-seven thousand, six hundred thirty-one".