1138858512 has 80 divisors (see below), whose sum is σ = 3214937088. Its totient is φ = 344525440.

The previous prime is 1138858451. The next prime is 1138858529. The reversal of 1138858512 is 2158588311.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390853 + ... + 393755.

Almost surely, 2^1138858512 is an apocalyptic number.

1138858512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138858512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1607468544).

1138858512 is an abundant number, since it is smaller than the sum of its proper divisors (2076078576).

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

1138858512 is a wasteful number, since it uses less digits than its factorization.

1138858512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668 (or 3662 counting only the distinct ones).

The product of its digits is 76800, while the sum is 42.

The square root of 1138858512 is about 33746.9778202434. The cubic root of 1138858512 is about 1044.2951412288.

The spelling of 1138858512 in words is "one billion, one hundred thirty-eight million, eight hundred fifty-eight thousand, five hundred twelve".