399399177 has 4 divisors (see below), whose sum is σ = 532532240. Its totient is φ = 266266116.

The previous prime is 399399167. The next prime is 399399199. The reversal of 399399177 is 771993993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 399399177 - 2²³ = 391010569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399399167) 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, 66566527 + ... + 66566532.

It is an arithmetic number, because the mean of its divisors is an integer number (133133060).

Almost surely, 2^399399177 is an apocalyptic number.

It is an amenable number.

399399177 is a deficient number, since it is larger than the sum of its proper divisors (133133063).

399399177 is a wasteful number, since it uses less digits than its factorization.

399399177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133133062.

The product of its digits is 2893401, while the sum is 57.

The square root of 399399177 is about 19984.9737803181. The cubic root of 399399177 is about 736.4372063904.

The spelling of 399399177 in words is "three hundred ninety-nine million, three hundred ninety-nine thousand, one hundred seventy-seven".