399505837 has 16 divisors (see below), whose sum is σ = 442085760. Its totient is φ = 359327232.

The previous prime is 399505829. The next prime is 399505867. The reversal of 399505837 is 738505993.

It is a cyclic number.

It is not a de Polignac number, because 399505837 - 2³ = 399505829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399505867) 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, 56533 + ... + 63205.

It is an arithmetic number, because the mean of its divisors is an integer number (27630360).

Almost surely, 2^399505837 is an apocalyptic number.

It is an amenable number.

399505837 is a deficient number, since it is larger than the sum of its proper divisors (42579923).

399505837 is a wasteful number, since it uses less digits than its factorization.

399505837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6852.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The square root of 399505837 is about 19987.6421070621. The cubic root of 399505837 is about 736.5027560174.

The spelling of 399505837 in words is "three hundred ninety-nine million, five hundred five thousand, eight hundred thirty-seven".