397831 has 12 divisors (see below), whose sum is σ = 484272. Its totient is φ = 325248.

The previous prime is 397829. The next prime is 397849. The reversal of 397831 is 138793.

It is not a de Polignac number, because 397831 - 2¹ = 397829 is a prime.

It is a super-2 number, since 2×397831² = 316539009122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397793 and 397802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 951 + ... + 1303.

It is an arithmetic number, because the mean of its divisors is an integer number (40356).

2³⁹⁷⁸³¹ is an apocalyptic number.

397831 is a deficient number, since it is larger than the sum of its proper divisors (86441).

397831 is a wasteful number, since it uses less digits than its factorization.

397831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 383 counting only the distinct ones).

The product of its digits is 4536, while the sum is 31.

The square root of 397831 is about 630.7384560973. The cubic root of 397831 is about 73.5472107876.

The spelling of 397831 in words is "three hundred ninety-seven thousand, eight hundred thirty-one".