399260961 has 32 divisors (see below), whose sum is σ = 647155200. Its totient is φ = 241269840.

The previous prime is 399260957. The next prime is 399260989. The reversal of 399260961 is 169062993.

It is a happy number.

399260961 is a `hidden beast` number, since 39 + 9 + 2 + 609 + 6 + 1 = 666.

It is not a de Polignac number, because 399260961 - 2² = 399260957 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399260941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110790 + ... + 114336.

It is an arithmetic number, because the mean of its divisors is an integer number (20223600).

Almost surely, 2^399260961 is an apocalyptic number.

It is an amenable number.

399260961 is a deficient number, since it is larger than the sum of its proper divisors (247894239).

399260961 is a wasteful number, since it uses less digits than its factorization.

399260961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946 (or 3940 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 399260961 is about 19981.5154830658. The cubic root of 399260961 is about 736.3522461513.

It can be divided in two parts, 39 and 9260961, that added together give a cube (9261000 = 210³).

The spelling of 399260961 in words is "three hundred ninety-nine million, two hundred sixty thousand, nine hundred sixty-one".