399505897 has 16 divisors (see below), whose sum is σ = 479048704. Its totient is φ = 325944000.

The previous prime is 399505889. The next prime is 399505901. The reversal of 399505897 is 798505993.

It is a cyclic number.

It is not a de Polignac number, because 399505897 - 2³ = 399505889 is a prime.

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, 1854 + ... + 28327.

It is an arithmetic number, because the mean of its divisors is an integer number (29940544).

Almost surely, 2^399505897 is an apocalyptic number.

It is an amenable number.

399505897 is a deficient number, since it is larger than the sum of its proper divisors (79542807).

399505897 is a wasteful number, since it uses less digits than its factorization.

399505897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30280.

The product of its (nonzero) digits is 3061800, while the sum is 55.

The square root of 399505897 is about 19987.6436079894. The cubic root of 399505897 is about 736.5027928881.

The spelling of 399505897 in words is "three hundred ninety-nine million, five hundred five thousand, eight hundred ninety-seven".