1381978016 has 24 divisors (see below), whose sum is σ = 2808537984. Its totient is φ = 668698560.

The previous prime is 1381978001. The next prime is 1381978033. The reversal of 1381978016 is 6108791831.

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, 695570 + ... + 697553.

It is an arithmetic number, because the mean of its divisors is an integer number (117022416).

Almost surely, 2^1381978016 is an apocalyptic number.

1381978016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1381978016 is an abundant number, since it is smaller than the sum of its proper divisors (1426559968).

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

1381978016 is a wasteful number, since it uses less digits than its factorization.

1381978016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393164 (or 1393156 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 1381978016 is about 37174.9649091966. The cubic root of 1381978016 is about 1113.8679592132.

The spelling of 1381978016 in words is "one billion, three hundred eighty-one million, nine hundred seventy-eight thousand, sixteen".