399858911 has 4 divisors (see below), whose sum is σ = 401620632. Its totient is φ = 398097192.

The previous prime is 399858839. The next prime is 399858917. The reversal of 399858911 is 119858993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399858911 is a prime.

It is a super-2 number, since 2×399858911² = 319774297412211842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399858917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880520 + ... + 880973.

It is an arithmetic number, because the mean of its divisors is an integer number (100405158).

Almost surely, 2^399858911 is an apocalyptic number.

399858911 is a deficient number, since it is larger than the sum of its proper divisors (1761721).

399858911 is a wasteful number, since it uses less digits than its factorization.

399858911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761720.

The product of its digits is 699840, while the sum is 53.

The square root of 399858911 is about 19996.4724639122. The cubic root of 399858911 is about 736.7196601540.

The spelling of 399858911 in words is "three hundred ninety-nine million, eight hundred fifty-eight thousand, nine hundred eleven".