399049191242 has 24 divisors (see below), whose sum is σ = 655442524620. Its totient is φ = 182107136640.

The previous prime is 399049191239. The next prime is 399049191253. The reversal of 399049191242 is 242191940993.

It can be written as a sum of positive squares in 6 ways, for example, as 498137761 + 398551053481 = 22319^2 + 631309^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6602609 + ... + 6662772.

Almost surely, 2^399049191242 is an apocalyptic number.

399049191242 is a deficient number, since it is larger than the sum of its proper divisors (256393333378).

399049191242 is a wasteful number, since it uses less digits than its factorization.

399049191242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13265498 (or 13265485 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 53.

The spelling of 399049191242 in words is "three hundred ninety-nine billion, forty-nine million, one hundred ninety-one thousand, two hundred forty-two".