1381888780 has 24 divisors (see below), whose sum is σ = 2903015808. Its totient is φ = 552555648.

The previous prime is 1381888733. The next prime is 1381888787. The reversal of 1381888780 is 878881831.

It is not an unprimeable number, because it can be changed into a prime (1381888787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52432 + ... + 74248.

It is an arithmetic number, because the mean of its divisors is an integer number (120958992).

Almost surely, 2^1381888780 is an apocalyptic number.

1381888780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381888780 is an abundant number, since it is smaller than the sum of its proper divisors (1521127028).

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

1381888780 is a wasteful number, since it uses less digits than its factorization.

1381888780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24993 (or 24991 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 52.

The square root of 1381888780 is about 37173.7646734898. The cubic root of 1381888780 is about 1113.8439840946.

The spelling of 1381888780 in words is "one billion, three hundred eighty-one million, eight hundred eighty-eight thousand, seven hundred eighty".