399507075 has 144 divisors (see below), whose sum is σ = 831946752. Its totient is φ = 181440000.

The previous prime is 399507071. The next prime is 399507083. The reversal of 399507075 is 570705993.

It is a happy number.

It is not a de Polignac number, because 399507075 - 2² = 399507071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 399507075.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399507071) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3145662 + ... + 3145788.

It is an arithmetic number, because the mean of its divisors is an integer number (5777408).

Almost surely, 2^399507075 is an apocalyptic number.

399507075 is an abundant number, since it is smaller than the sum of its proper divisors (432439677).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399507075 is a wasteful number, since it uses less digits than its factorization.

399507075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 297675, while the sum is 45.

The square root of 399507075 is about 19987.6730761737. The cubic root of 399507075 is about 736.5035167818.

The spelling of 399507075 in words is "three hundred ninety-nine million, five hundred seven thousand, seventy-five".