397818645 has 32 divisors (see below), whose sum is σ = 729568512. Its totient is φ = 181327872.

The previous prime is 397818623. The next prime is 397818667. The reversal of 397818645 is 546818793.

It is an interprime number because it is at equal distance from previous prime (397818623) and next prime (397818667).

It is not a de Polignac number, because 397818645 - 2¹⁸ = 397556501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31699 + ... + 42431.

It is an arithmetic number, because the mean of its divisors is an integer number (22799016).

Almost surely, 2^397818645 is an apocalyptic number.

397818645 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

397818645 is a deficient number, since it is larger than the sum of its proper divisors (331749867).

397818645 is a wasteful number, since it uses less digits than its factorization.

397818645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101.

The product of its digits is 1451520, while the sum is 51.

The square root of 397818645 is about 19945.3915729925. The cubic root of 397818645 is about 735.4644942140.

The spelling of 397818645 in words is "three hundred ninety-seven million, eight hundred eighteen thousand, six hundred forty-five".