399508955 has 4 divisors (see below), whose sum is σ = 479410752. Its totient is φ = 319607160.

The previous prime is 399508939. The next prime is 399508969. The reversal of 399508955 is 559805993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 559805993 = 23 ⋅24339391.

It is not a de Polignac number, because 399508955 - 2⁴ = 399508939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399508897 and 399508906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39950891 + ... + 39950900.

It is an arithmetic number, because the mean of its divisors is an integer number (119852688).

Almost surely, 2^399508955 is an apocalyptic number.

399508955 is a deficient number, since it is larger than the sum of its proper divisors (79901797).

399508955 is an equidigital number, since it uses as much as digits as its factorization.

399508955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79901796.

The product of its (nonzero) digits is 2187000, while the sum is 53.

The square root of 399508955 is about 19987.7201051045. The cubic root of 399508955 is about 736.5046720592.

The spelling of 399508955 in words is "three hundred ninety-nine million, five hundred eight thousand, nine hundred fifty-five".