3918981560 has 96 divisors (see below), whose sum is σ = 9856702080. Its totient is φ = 1400256000.

The previous prime is 3918981557. The next prime is 3918981571. The reversal of 3918981560 is 651898193.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 3918981499 and 3918981508.

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, 200210 + ... + 218910.

It is an arithmetic number, because the mean of its divisors is an integer number (102673980).

Almost surely, 2^3918981560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3918981560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4928351040).

3918981560 is an abundant number, since it is smaller than the sum of its proper divisors (5937720520).

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

3918981560 is a wasteful number, since it uses less digits than its factorization.

3918981560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18769 (or 18752 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 3918981560 is about 62601.7696235498. The cubic root of 3918981560 is about 1576.6104712830.

The spelling of 3918981560 in words is "three billion, nine hundred eighteen million, nine hundred eighty-one thousand, five hundred sixty".