399039855 has 16 divisors (see below), whose sum is σ = 660480480. Its totient is φ = 205482368.

The previous prime is 399039853. The next prime is 399039863. The reversal of 399039855 is 558930993.

It is a cyclic number.

It is not a de Polignac number, because 399039855 - 2¹ = 399039853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399039798 and 399039807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399039853) 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 15 ways as a sum of consecutive naturals, for example, 458232 + ... + 459101.

It is an arithmetic number, because the mean of its divisors is an integer number (41280030).

Almost surely, 2^399039855 is an apocalyptic number.

399039855 is a deficient number, since it is larger than the sum of its proper divisors (261440625).

399039855 is a wasteful number, since it uses less digits than its factorization.

399039855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917370.

The product of its (nonzero) digits is 1312200, while the sum is 51.

The square root of 399039855 is about 19975.9819533359. The cubic root of 399039855 is about 736.2162933290.

The spelling of 399039855 in words is "three hundred ninety-nine million, thirty-nine thousand, eight hundred fifty-five".