1138255920 has 60 divisors (see below), whose sum is σ = 3822645216. Its totient is φ = 303534720.

The previous prime is 1138255919. The next prime is 1138255949. The reversal of 1138255920 is 295528311.

1138255920 is a `hidden beast` number, since 1 + 1 + 3 + 82 + 559 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 789736 + ... + 791175.

Almost surely, 2^1138255920 is an apocalyptic number.

1138255920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1138255920 is an abundant number, since it is smaller than the sum of its proper divisors (2684389296).

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

1138255920 is a wasteful number, since it uses less digits than its factorization.

1138255920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580930 (or 1580921 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 1138255920 is about 33738.0485505608. The cubic root of 1138255920 is about 1044.1109231682.

The spelling of 1138255920 in words is "one billion, one hundred thirty-eight million, two hundred fifty-five thousand, nine hundred twenty".