1388919460 has 12 divisors (see below), whose sum is σ = 2916730908. Its totient is φ = 555567776.

The previous prime is 1388919457. The next prime is 1388919473. The reversal of 1388919460 is 649198831.

It can be written as a sum of positive squares in 2 ways, for example, as 604471396 + 784448064 = 24586^2 + 28008^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34722967 + ... + 34723006.

It is an arithmetic number, because the mean of its divisors is an integer number (243060909).

Almost surely, 2^1388919460 is an apocalyptic number.

1388919460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388919460 is an abundant number, since it is smaller than the sum of its proper divisors (1527811448).

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

1388919460 is a wasteful number, since it uses less digits than its factorization.

1388919460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69445982 (or 69445980 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 1388919460 is about 37268.2097772351. The cubic root of 1388919460 is about 1115.7297695339.

The spelling of 1388919460 in words is "one billion, three hundred eighty-eight million, nine hundred nineteen thousand, four hundred sixty".