399259242 has 12 divisors (see below), whose sum is σ = 865061730. Its totient is φ = 133086408.

The previous prime is 399259207. The next prime is 399259243. The reversal of 399259242 is 242952993.

399259242 is a `hidden beast` number, since 399 + 259 + 2 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 352350441 + 46908801 = 18771^2 + 6849^2 .

It is not an unprimeable number, because it can be changed into a prime (399259243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11090517 + ... + 11090552.

Almost surely, 2^399259242 is an apocalyptic number.

399259242 is an abundant number, since it is smaller than the sum of its proper divisors (465802488).

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

399259242 is a wasteful number, since it uses less digits than its factorization.

399259242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22181077 (or 22181074 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 399259242 is about 19981.4724682642. The cubic root of 399259242 is about 736.3511893727.

The spelling of 399259242 in words is "three hundred ninety-nine million, two hundred fifty-nine thousand, two hundred forty-two".