399608111 has 4 divisors (see below), whose sum is σ = 456694992. Its totient is φ = 342521232.

The previous prime is 399608107. The next prime is 399608117. The reversal of 399608111 is 111806993.

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 399608111 - 2² = 399608107 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 (399608117) 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, 28543430 + ... + 28543443.

It is an arithmetic number, because the mean of its divisors is an integer number (114173748).

Almost surely, 2^399608111 is an apocalyptic number.

399608111 is a deficient number, since it is larger than the sum of its proper divisors (57086881).

399608111 is an equidigital number, since it uses as much as digits as its factorization.

399608111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57086880.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 399608111 is about 19990.2003741833. The cubic root of 399608111 is about 736.5655992011.

The spelling of 399608111 in words is "three hundred ninety-nine million, six hundred eight thousand, one hundred eleven".