3999600000400 has 30 divisors (see below), whose sum is σ = 9609039001922. Its totient is φ = 1599840000000.

The previous prime is 3999600000391. The next prime is 3999600000449. The reversal of 3999600000400 is 40000069993.

It can be written as a sum of positive squares in 3 ways, for example, as 664622779536 + 3334977220864 = 815244^2 + 1826192^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

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 5 ways as a sum of consecutive naturals, for example, 4999499601 + ... + 4999500400.

Almost surely, 2^{3999600000400} is an apocalyptic number.

It is an amenable number.

3999600000400 is an abundant number, since it is smaller than the sum of its proper divisors (5609439001522).

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

3999600000400 is a wasteful number, since it uses less digits than its factorization.

3999600000400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9999000019 (or 9999000008 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 40.

The spelling of 3999600000400 in words is "three trillion, nine hundred ninety-nine billion, six hundred million, four hundred", and thus it is an aban number.