399870311 has 16 divisors (see below), whose sum is σ = 433097280. Its totient is φ = 367802880.

The previous prime is 399870307. The next prime is 399870323. The reversal of 399870311 is 113078993.

It is a cyclic number.

It is not a de Polignac number, because 399870311 - 2² = 399870307 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 (399870301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172025 + ... + 174333.

It is an arithmetic number, because the mean of its divisors is an integer number (27068580).

Almost surely, 2^399870311 is an apocalyptic number.

399870311 is a deficient number, since it is larger than the sum of its proper divisors (33226969).

399870311 is a wasteful number, since it uses less digits than its factorization.

399870311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 399870311 is about 19996.7575121568. The cubic root of 399870311 is about 736.7266613938.

The spelling of 399870311 in words is "three hundred ninety-nine million, eight hundred seventy thousand, three hundred eleven".