397631 has 8 divisors (see below), whose sum is σ = 435120. Its totient is φ = 361152.

The previous prime is 397597. The next prime is 397633. The reversal of 397631 is 136793.

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

It is a cyclic number.

It is not a de Polignac number, because 397631 - 2⁶ = 397567 is a prime.

It is a super-2 number, since 2×397631² = 316220824322, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3² + 9 + 6⁷ + 7⁶ + 3³ + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397594 and 397603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397633) 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, 740 + ... + 1158.

It is an arithmetic number, because the mean of its divisors is an integer number (54390).

2³⁹⁷⁶³¹ is an apocalyptic number.

397631 is a deficient number, since it is larger than the sum of its proper divisors (37489).

397631 is a wasteful number, since it uses less digits than its factorization.

397631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505.

The product of its digits is 3402, while the sum is 29.

The square root of 397631 is about 630.5798918456. The cubic root of 397631 is about 73.5348840225.

It can be divided in two parts, 3976 and 31, that multiplied together give a triangular number (123256 = T₄₉₆).

The spelling of 397631 in words is "three hundred ninety-seven thousand, six hundred thirty-one".