399242442013 has 4 divisors (see below), whose sum is σ = 399259970080. Its totient is φ = 399224913948.

The previous prime is 399242442007. The next prime is 399242442059. The reversal of 399242442013 is 310244242993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399242442013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399242442713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8729823 + ... + 8775436.

It is an arithmetic number, because the mean of its divisors is an integer number (99814992520).

Almost surely, 2^399242442013 is an apocalyptic number.

It is an amenable number.

399242442013 is a deficient number, since it is larger than the sum of its proper divisors (17528067).

399242442013 is a wasteful number, since it uses less digits than its factorization.

399242442013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17528066.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 399242442013 in words is "three hundred ninety-nine billion, two hundred forty-two million, four hundred forty-two thousand, thirteen".