3991538602998 has 48 divisors (see below), whose sum is σ = 8970088916880. Its totient is φ = 1330298258976.

The previous prime is 3991538602939. The next prime is 3991538603009. The reversal of 3991538602998 is 8992068351993.

It is a happy number.

3991538602998 is a `hidden beast` number, since 3 + 9 + 9 + 1 + 5 + 3 + 8 + 602 + 9 + 9 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2368036 + ... + 3686552.

It is an arithmetic number, because the mean of its divisors is an integer number (186876852435).

Almost surely, 2^{3991538602998} is an apocalyptic number.

3991538602998 is an abundant number, since it is smaller than the sum of its proper divisors (4978550313882).

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

3991538602998 is a wasteful number, since it uses less digits than its factorization.

3991538602998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324763 (or 1324751 counting only the distinct ones).

The product of its (nonzero) digits is 226748160, while the sum is 72.

The spelling of 3991538602998 in words is "three trillion, nine hundred ninety-one billion, five hundred thirty-eight million, six hundred two thousand, nine hundred ninety-eight".