3988914192640 has 108 divisors (see below), whose sum is σ = 10346209868484. Its totient is φ = 1472829775872.

The previous prime is 3988914192631. The next prime is 3988914192671. The reversal of 3988914192640 is 462914198893.

It can be written as a sum of positive squares in 6 ways, for example, as 1778958418176 + 2209955774464 = 1333776^2 + 1486592^2 .

It is a super-2 number, since 2×3988914192640² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9003619 + ... + 9436258.

It is an arithmetic number, because the mean of its divisors is an integer number (95798239523).

Almost surely, 2^{3988914192640} is an apocalyptic number.

It is an amenable number.

3988914192640 is an abundant number, since it is smaller than the sum of its proper divisors (6357295675844).

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

3988914192640 is a wasteful number, since it uses less digits than its factorization.

3988914192640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18439924 (or 18439897 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 64.

The spelling of 3988914192640 in words is "three trillion, nine hundred eighty-eight billion, nine hundred fourteen million, one hundred ninety-two thousand, six hundred forty".