3990988142556 has 12 divisors (see below), whose sum is σ = 9312305665992. Its totient is φ = 1330329380848.

The previous prime is 3990988142489. The next prime is 3990988142641. The reversal of 3990988142556 is 6552418890993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166291172595 + ... + 166291172618.

It is an arithmetic number, because the mean of its divisors is an integer number (776025472166).

Almost surely, 2^{3990988142556} is an apocalyptic number.

It is an amenable number.

3990988142556 is an abundant number, since it is smaller than the sum of its proper divisors (5321317523436).

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

3990988142556 is a wasteful number, since it uses less digits than its factorization.

3990988142556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332582345220 (or 332582345218 counting only the distinct ones).

The product of its (nonzero) digits is 167961600, while the sum is 69.

The spelling of 3990988142556 in words is "three trillion, nine hundred ninety billion, nine hundred eighty-eight million, one hundred forty-two thousand, five hundred fifty-six".