1388388480 has 64 divisors (see below), whose sum is σ = 4425494400. Its totient is φ = 370236416.

The previous prime is 1388388479. The next prime is 1388388497. The reversal of 1388388480 is 848838831.

It is a tau number, because it is divible by the number of its divisors (64).

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, 359640 + ... + 363479.

It is an arithmetic number, because the mean of its divisors is an integer number (69148350).

Almost surely, 2^1388388480 is an apocalyptic number.

1388388480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388388480 is an abundant number, since it is smaller than the sum of its proper divisors (3037105920).

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

1388388480 is an equidigital number, since it uses as much as digits as its factorization.

1388388480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723141 (or 723129 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 51.

The square root of 1388388480 is about 37261.0853304087. The cubic root of 1388388480 is about 1115.5875712949.

The spelling of 1388388480 in words is "one billion, three hundred eighty-eight million, three hundred eighty-eight thousand, four hundred eighty".