397287213 has 8 divisors (see below), whose sum is σ = 529932000. Its totient is φ = 264750288.

The previous prime is 397287181. The next prime is 397287223. The reversal of 397287213 is 312782793.

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

It is not a de Polignac number, because 397287213 - 2⁵ = 397287181 is a prime.

It is a super-2 number, since 2×397287213² = 315674259226614738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397287223) 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, 17938 + ... + 33411.

It is an arithmetic number, because the mean of its divisors is an integer number (66241500).

Almost surely, 2^397287213 is an apocalyptic number.

It is an amenable number.

397287213 is a deficient number, since it is larger than the sum of its proper divisors (132644787).

397287213 is a wasteful number, since it uses less digits than its factorization.

397287213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53931.

The product of its digits is 127008, while the sum is 42.

The square root of 397287213 is about 19932.0649457100. The cubic root of 397287213 is about 735.1368545203.

The spelling of 397287213 in words is "three hundred ninety-seven million, two hundred eighty-seven thousand, two hundred thirteen".