399855263 has 16 divisors (see below), whose sum is σ = 421181664. Its totient is φ = 379209600.

The previous prime is 399855259. The next prime is 399855271. The reversal of 399855263 is 362558993.

It is a cyclic number.

It is not a de Polignac number, because 399855263 - 2² = 399855259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399855163) 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, 249581 + ... + 251177.

It is an arithmetic number, because the mean of its divisors is an integer number (26323854).

Almost surely, 2^399855263 is an apocalyptic number.

399855263 is a deficient number, since it is larger than the sum of its proper divisors (21326401).

399855263 is a wasteful number, since it uses less digits than its factorization.

399855263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802.

The product of its digits is 1749600, while the sum is 50.

The square root of 399855263 is about 19996.3812476158. The cubic root of 399855263 is about 736.7174197292.

The spelling of 399855263 in words is "three hundred ninety-nine million, eight hundred fifty-five thousand, two hundred sixty-three".