3978117512 has 8 divisors (see below), whose sum is σ = 7458970350. Its totient is φ = 1989058752.

The previous prime is 3978117503. The next prime is 3978117547. The reversal of 3978117512 is 2157118793.

It can be written as a sum of positive squares in only one way, i.e., 2294984836 + 1683132676 = 47906^2 + 41026^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248632337 + ... + 248632352.

Almost surely, 2^3978117512 is an apocalyptic number.

It is an amenable number.

3978117512 is a deficient number, since it is larger than the sum of its proper divisors (3480852838).

3978117512 is a wasteful number, since it uses less digits than its factorization.

3978117512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497264695 (or 497264691 counting only the distinct ones).

The product of its digits is 105840, while the sum is 44.

The square root of 3978117512 is about 63072.3196973125. The cubic root of 3978117512 is about 1584.5010669084.

The spelling of 3978117512 in words is "three billion, nine hundred seventy-eight million, one hundred seventeen thousand, five hundred twelve".