399045591 has 24 divisors (see below), whose sum is σ = 669547424. Its totient is φ = 224285760.

The previous prime is 399045589. The next prime is 399045593. The reversal of 399045591 is 195540993.

It is a happy number.

399045591 is a `hidden beast` number, since 3 + 9 + 90 + 4 + 559 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (399045589) and next prime (399045593).

It is not a de Polignac number, because 399045591 - 2¹ = 399045589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399045593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48076 + ... + 55761.

Almost surely, 2^399045591 is an apocalyptic number.

399045591 is a deficient number, since it is larger than the sum of its proper divisors (270501833).

399045591 is a wasteful number, since it uses less digits than its factorization.

399045591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103911 (or 103908 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The square root of 399045591 is about 19976.1255252364. The cubic root of 399045591 is about 736.2198208935.

The spelling of 399045591 in words is "three hundred ninety-nine million, forty-five thousand, five hundred ninety-one".