399771355 has 16 divisors (see below), whose sum is σ = 484128000. Its totient is φ = 316895328.

The previous prime is 399771313. The next prime is 399771373. The reversal of 399771355 is 553177993.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 399771355 - 2⁷ = 399771227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399771299 and 399771308.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406194 + ... + 407176.

It is an arithmetic number, because the mean of its divisors is an integer number (30258000).

Almost surely, 2^399771355 is an apocalyptic number.

399771355 is a deficient number, since it is larger than the sum of its proper divisors (84356645).

399771355 is a wasteful number, since it uses less digits than its factorization.

399771355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650.

The product of its digits is 893025, while the sum is 49.

The square root of 399771355 is about 19994.2830579143. The cubic root of 399771355 is about 736.6658837398.

The spelling of 399771355 in words is "three hundred ninety-nine million, seven hundred seventy-one thousand, three hundred fifty-five".