399796350621 has 16 divisors (see below), whose sum is σ = 563279400960. Its totient is φ = 251715475440.

The previous prime is 399796350563. The next prime is 399796350643. The reversal of 399796350621 is 126053697993.

It is not a de Polignac number, because 399796350621 - 2¹⁰ = 399796349597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399796350661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36666385 + ... + 36677286.

It is an arithmetic number, because the mean of its divisors is an integer number (35204962560).

Almost surely, 2^399796350621 is an apocalyptic number.

It is an amenable number.

399796350621 is a deficient number, since it is larger than the sum of its proper divisors (163483050339).

399796350621 is a wasteful number, since it uses less digits than its factorization.

399796350621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73343776.

The product of its (nonzero) digits is 16533720, while the sum is 60.

The spelling of 399796350621 in words is "three hundred ninety-nine billion, seven hundred ninety-six million, three hundred fifty thousand, six hundred twenty-one".