399451374848 has 36 divisors (see below), whose sum is σ = 818892206580. Its totient is φ = 194327691264.

The previous prime is 399451374827. The next prime is 399451374919. The reversal of 399451374848 is 848473154993.

It can be written as a sum of positive squares in 2 ways, for example, as 140199322624 + 259252052224 = 374432^2 + 509168^2 .

It is a super-2 number, since 2×399451374848² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21076433 + ... + 21095376.

Almost surely, 2^399451374848 is an apocalyptic number.

It is an amenable number.

399451374848 is an abundant number, since it is smaller than the sum of its proper divisors (419440831732).

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

399451374848 is an equidigital number, since it uses as much as digits as its factorization.

399451374848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42171862 (or 42171848 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 65.

The spelling of 399451374848 in words is "three hundred ninety-nine billion, four hundred fifty-one million, three hundred seventy-four thousand, eight hundred forty-eight".