397969 has 16 divisors (see below), whose sum is σ = 491904. Its totient is φ = 319440.

The previous prime is 397963. The next prime is 397973. The reversal of 397969 is 969793.

It is not a de Polignac number, because 397969 - 2¹¹ = 395921 is a prime.

It is a super-2 number, since 2×397969² = 316758649922, 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 (397963) 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 15 ways as a sum of consecutive naturals, for example, 17292 + ... + 17314.

It is an arithmetic number, because the mean of its divisors is an integer number (30744).

2³⁹⁷⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

397969 is a deficient number, since it is larger than the sum of its proper divisors (93935).

397969 is a wasteful number, since it uses less digits than its factorization.

397969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69 (or 47 counting only the distinct ones).

The product of its digits is 91854, while the sum is 43.

The square root of 397969 is about 630.8478421933. The cubic root of 397969 is about 73.5557138469. Note that the first 3 decimals are identical.

It can be divided in two parts, 39 and 7969, that added together give a palindrome (8008).

The spelling of 397969 in words is "three hundred ninety-seven thousand, nine hundred sixty-nine".