397491 has 8 divisors (see below), whose sum is σ = 544464. Its totient is φ = 257760.

The previous prime is 397489. The next prime is 397493. The reversal of 397491 is 194793.

It is an interprime number because it is at equal distance from previous prime (397489) and next prime (397493).

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

It is not a de Polignac number, because 397491 - 2¹ = 397489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397493) 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, 1680 + ... + 1901.

It is an arithmetic number, because the mean of its divisors is an integer number (68058).

2³⁹⁷⁴⁹¹ is an apocalyptic number.

397491 is a deficient number, since it is larger than the sum of its proper divisors (146973).

397491 is a wasteful number, since it uses less digits than its factorization.

397491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3621.

The product of its digits is 6804, while the sum is 33.

The square root of 397491 is about 630.4688731413. The cubic root of 397491 is about 73.5262528274.

It can be divided in two parts, 397 and 491, that added together give a palindrome (888).

The spelling of 397491 in words is "three hundred ninety-seven thousand, four hundred ninety-one".