399704161 has 4 divisors (see below), whose sum is σ = 399985300. Its totient is φ = 399423024.

The previous prime is 399704131. The next prime is 399704177. The reversal of 399704161 is 161407993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 187827025 + 211877136 = 13705^2 + 14556^2 .

It is a cyclic number.

It is not a de Polignac number, because 399704161 - 2⁷ = 399704033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399704101) 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, 138426 + ... + 141283.

It is an arithmetic number, because the mean of its divisors is an integer number (99996325).

Almost surely, 2^399704161 is an apocalyptic number.

It is an amenable number.

399704161 is a deficient number, since it is larger than the sum of its proper divisors (281139).

399704161 is a wasteful number, since it uses less digits than its factorization.

399704161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281138.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 399704161 is about 19992.6026569829. The cubic root of 399704161 is about 736.6246082288.

The spelling of 399704161 in words is "three hundred ninety-nine million, seven hundred four thousand, one hundred sixty-one".