399847845 has 8 divisors (see below), whose sum is σ = 639756576. Its totient is φ = 213252176.

The previous prime is 399847843. The next prime is 399847859. The reversal of 399847845 is 548748993.

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

It is a cyclic number.

It is not a de Polignac number, because 399847845 - 2¹ = 399847843 is a prime.

It is a super-2 number, since 2×399847845² = 319756598302288050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399847843) 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, 13328247 + ... + 13328276.

It is an arithmetic number, because the mean of its divisors is an integer number (79969572).

Almost surely, 2^399847845 is an apocalyptic number.

It is an amenable number.

399847845 is a deficient number, since it is larger than the sum of its proper divisors (239908731).

399847845 is a wasteful number, since it uses less digits than its factorization.

399847845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26656531.

The product of its digits is 8709120, while the sum is 57.

The square root of 399847845 is about 19996.1957631946. The cubic root of 399847845 is about 736.7128639110.

The spelling of 399847845 in words is "three hundred ninety-nine million, eight hundred forty-seven thousand, eight hundred forty-five".