399055565 has 8 divisors (see below), whose sum is σ = 479009760. Its totient is φ = 319149072.

The previous prime is 399055549. The next prime is 399055577. The reversal of 399055565 is 565550993.

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 399055565 - 2⁴ = 399055549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10226 + ... + 30044.

It is an arithmetic number, because the mean of its divisors is an integer number (59876220).

Almost surely, 2^399055565 is an apocalyptic number.

It is an amenable number.

399055565 is a deficient number, since it is larger than the sum of its proper divisors (79954195).

399055565 is a wasteful number, since it uses less digits than its factorization.

399055565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23851.

The product of its (nonzero) digits is 911250, while the sum is 47.

The square root of 399055565 is about 19976.3751716872. The cubic root of 399055565 is about 736.2259546916.

The spelling of 399055565 in words is "three hundred ninety-nine million, fifty-five thousand, five hundred sixty-five".