399168005 has 16 divisors (see below), whose sum is σ = 491433264. Its totient is φ = 311070720.

The previous prime is 399167983. The next prime is 399168019. The reversal of 399168005 is 500861993.

It can be written as a sum of positive squares in 8 ways, for example, as 407044 + 398760961 = 638^2 + 19969^2 .

It is a de Polignac number, because none of the positive numbers 2^k-399168005 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199289 + ... + 201281.

It is an arithmetic number, because the mean of its divisors is an integer number (30714579).

Almost surely, 2^399168005 is an apocalyptic number.

It is an amenable number.

399168005 is a deficient number, since it is larger than the sum of its proper divisors (92265259).

399168005 is a wasteful number, since it uses less digits than its factorization.

399168005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 399168005 is about 19979.1892978669. The cubic root of 399168005 is about 736.2950958337.

The spelling of 399168005 in words is "three hundred ninety-nine million, one hundred sixty-eight thousand, five".