399104645 has 4 divisors (see below), whose sum is σ = 478925580. Its totient is φ = 319283712.

The previous prime is 399104617. The next prime is 399104659. The reversal of 399104645 is 546401993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546401993 = 353 ⋅1547881.

It can be written as a sum of positive squares in 2 ways, for example, as 306040036 + 93064609 = 17494^2 + 9647^2 .

It is a cyclic number.

It is not a de Polignac number, because 399104645 - 2⁸ = 399104389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39910460 + ... + 39910469.

It is an arithmetic number, because the mean of its divisors is an integer number (119731395).

Almost surely, 2^399104645 is an apocalyptic number.

It is an amenable number.

399104645 is a deficient number, since it is larger than the sum of its proper divisors (79820935).

399104645 is an equidigital number, since it uses as much as digits as its factorization.

399104645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79820934.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 399104645 is about 19977.6035850149. The cubic root of 399104645 is about 736.2561363603.

The spelling of 399104645 in words is "three hundred ninety-nine million, one hundred four thousand, six hundred forty-five".