399592074421 has 16 divisors (see below), whose sum is σ = 420432476400. Its totient is φ = 379272560128.

The previous prime is 399592074407. The next prime is 399592074451. The reversal of 399592074421 is 124470295993.

399592074421 = 446985² + 446986².

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 84550100625 + 315041973796 = 290775^2 + 561286^2 .

It is a 5-Lehmer number, since φ(399592074421) divides (399592074421-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 399592074421 - 2¹³ = 399592066229 is a prime.

It is a super-3 number, since 3×399592074421³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399592074451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 946 + ... + 893971.

It is an arithmetic number, because the mean of its divisors is an integer number (26277029775).

Almost surely, 2^399592074421 is an apocalyptic number.

399592074421 is the 446986-th centered square number.

It is an amenable number.

399592074421 is a deficient number, since it is larger than the sum of its proper divisors (20840401979).

399592074421 is a wasteful number, since it uses less digits than its factorization.

399592074421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895208.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 399592074421 in words is "three hundred ninety-nine billion, five hundred ninety-two million, seventy-four thousand, four hundred twenty-one".