1387996560 has 120 divisors (see below), whose sum is σ = 4834065600. Its totient is φ = 370127232.

The previous prime is 1387996559. The next prime is 1387996639. The reversal of 1387996560 is 656997831.

1387996560 is a `hidden beast` number, since 1 + 3 + 8 + 79 + 9 + 6 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1387996497 and 1387996506.

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, 16260 + ... + 55139.

It is an arithmetic number, because the mean of its divisors is an integer number (40283880).

Almost surely, 2^1387996560 is an apocalyptic number.

1387996560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387996560 is an abundant number, since it is smaller than the sum of its proper divisors (3446069040).

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

1387996560 is an equidigital number, since it uses as much as digits as its factorization.

1387996560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71427 (or 71409 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 1387996560 is about 37255.8258531468. The cubic root of 1387996560 is about 1115.4825905363.

The spelling of 1387996560 in words is "one billion, three hundred eighty-seven million, nine hundred ninety-six thousand, five hundred sixty".