1388444080 has 20 divisors (see below), whose sum is σ = 3228132672. Its totient is φ = 555377600.

The previous prime is 1388444069. The next prime is 1388444087. The reversal of 1388444080 is 804448831.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1388444087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8677696 + ... + 8677855.

Almost surely, 2^1388444080 is an apocalyptic number.

1388444080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388444080 is an abundant number, since it is smaller than the sum of its proper divisors (1839688592).

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

1388444080 is a wasteful number, since it uses less digits than its factorization.

1388444080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17355564 (or 17355558 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 1388444080 is about 37261.8314096342. The cubic root of 1388444080 is about 1115.6024628621.

The spelling of 1388444080 in words is "one billion, three hundred eighty-eight million, four hundred forty-four thousand, eighty".