1138904784 has 120 divisors (see below), whose sum is σ = 3323453952. Its totient is φ = 363674880.

The previous prime is 1138904761. The next prime is 1138904813. The reversal of 1138904784 is 4874098311.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 458554 + ... + 461030.

Almost surely, 2^1138904784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138904784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1661726976).

1138904784 is an abundant number, since it is smaller than the sum of its proper divisors (2184549168).

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

1138904784 is a wasteful number, since it uses less digits than its factorization.

1138904784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625 (or 2616 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1138904784 is about 33747.6633857812. The cubic root of 1138904784 is about 1044.3092843290.

The spelling of 1138904784 in words is "one billion, one hundred thirty-eight million, nine hundred four thousand, seven hundred eighty-four".