1388891380 has 24 divisors (see below), whose sum is σ = 2920649760. Its totient is φ = 554798880.

The previous prime is 1388891353. The next prime is 1388891417. The reversal of 1388891380 is 831988831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32206 + ... + 61765.

It is an arithmetic number, because the mean of its divisors is an integer number (121693740).

Almost surely, 2^1388891380 is an apocalyptic number.

1388891380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388891380 is an abundant number, since it is smaller than the sum of its proper divisors (1531758380).

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

1388891380 is a wasteful number, since it uses less digits than its factorization.

1388891380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94719 (or 94717 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 1388891380 is about 37267.8330467442. The cubic root of 1388891380 is about 1115.7222505226.

The spelling of 1388891380 in words is "one billion, three hundred eighty-eight million, eight hundred ninety-one thousand, three hundred eighty".