399980911 has 4 divisors (see below), whose sum is σ = 436342824. Its totient is φ = 363619000.

The previous prime is 399980909. The next prime is 399980923. The reversal of 399980911 is 119089993.

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

It is a cyclic number.

It is not a de Polignac number, because 399980911 - 2¹ = 399980909 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 (399980311) 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, 18180940 + ... + 18180961.

It is an arithmetic number, because the mean of its divisors is an integer number (109085706).

Almost surely, 2^399980911 is an apocalyptic number.

399980911 is a deficient number, since it is larger than the sum of its proper divisors (36361913).

399980911 is a wasteful number, since it uses less digits than its factorization.

399980911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36361912.

The product of its (nonzero) digits is 157464, while the sum is 49.

The square root of 399980911 is about 19999.5227693063. The cubic root of 399980911 is about 736.7945787954.

The spelling of 399980911 in words is "three hundred ninety-nine million, nine hundred eighty thousand, nine hundred eleven".