1387320780 has 48 divisors (see below), whose sum is σ = 3902943744. Its totient is φ = 368195520.

The previous prime is 1387320769. The next prime is 1387320791. The reversal of 1387320780 is 870237831.

It is an interprime number because it is at equal distance from previous prime (1387320769) and next prime (1387320791).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42132 + ... + 67451.

It is an arithmetic number, because the mean of its divisors is an integer number (81311328).

Almost surely, 2^1387320780 is an apocalyptic number.

1387320780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387320780 is an abundant number, since it is smaller than the sum of its proper divisors (2515622964).

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

1387320780 is a wasteful number, since it uses less digits than its factorization.

1387320780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109806 (or 109804 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 1387320780 is about 37246.7552949247. The cubic root of 1387320780 is about 1115.3015278405.

The spelling of 1387320780 in words is "one billion, three hundred eighty-seven million, three hundred twenty thousand, seven hundred eighty".