397182645 has 24 divisors (see below), whose sum is σ = 728948376. Its totient is φ = 199369728.

The previous prime is 397182623. The next prime is 397182661. The reversal of 397182645 is 546281793.

It can be written as a sum of positive squares in 4 ways, for example, as 2643876 + 394538769 = 1626^2 + 19863^2 .

It is not a de Polignac number, because 397182645 - 2¹⁰ = 397181621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 397182645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 258832 + ... + 260361.

It is an arithmetic number, because the mean of its divisors is an integer number (30372849).

Almost surely, 2^397182645 is an apocalyptic number.

It is an amenable number.

397182645 is a deficient number, since it is larger than the sum of its proper divisors (331765731).

397182645 is a wasteful number, since it uses less digits than its factorization.

397182645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519221 (or 519218 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 397182645 is about 19929.4416630271. The cubic root of 397182645 is about 735.0723516171.

The spelling of 397182645 in words is "three hundred ninety-seven million, one hundred eighty-two thousand, six hundred forty-five".