399169885 has 16 divisors (see below), whose sum is σ = 483325056. Its totient is φ = 316467648.

The previous prime is 399169873. The next prime is 399169889. The reversal of 399169885 is 588961993.

It is a cyclic number.

It is not a de Polignac number, because 399169885 - 2⁹ = 399169373 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 (399169889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526927 + ... + 527683.

It is an arithmetic number, because the mean of its divisors is an integer number (30207816).

Almost surely, 2^399169885 is an apocalyptic number.

It is an amenable number.

399169885 is a deficient number, since it is larger than the sum of its proper divisors (84155171).

399169885 is a wasteful number, since it uses less digits than its factorization.

399169885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its digits is 4199040, while the sum is 58.

The square root of 399169885 is about 19979.2363467676. The cubic root of 399169885 is about 736.2962517652.

The spelling of 399169885 in words is "three hundred ninety-nine million, one hundred sixty-nine thousand, eight hundred eighty-five".