1338918780 has 48 divisors (see below), whose sum is σ = 3911975424. Its totient is φ = 341520960.

The previous prime is 1338918773. The next prime is 1338918851. The reversal of 1338918780 is 878198331.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483736 + ... + 486495.

It is an arithmetic number, because the mean of its divisors is an integer number (81499488).

Almost surely, 2^1338918780 is an apocalyptic number.

1338918780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1338918780 is an abundant number, since it is smaller than the sum of its proper divisors (2573056644).

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

1338918780 is a wasteful number, since it uses less digits than its factorization.

1338918780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970266 (or 970264 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 1338918780 is about 36591.2391153948. The cubic root of 1338918780 is about 1102.1771700965.

The spelling of 1338918780 in words is "one billion, three hundred thirty-eight million, nine hundred eighteen thousand, seven hundred eighty".