1139638500 has 864 divisors, whose sum is σ = 5075126784. Its totient is φ = 209088000.

The previous prime is 1139638481. The next prime is 1139638529. The reversal of 1139638500 is 58369311.

It is a happy number.

1139638500 is a `hidden beast` number, since 1 + 13 + 9 + 638 + 5 + 0 + 0 = 666.

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 287 ways as a sum of consecutive naturals, for example, 49549489 + ... + 49549511.

Almost surely, 2^1139638500 is an apocalyptic number.

1139638500 is a gapful number since it is divisible by the number (10) 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 1139638500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2537563392).

1139638500 is an abundant number, since it is smaller than the sum of its proper divisors (3935488284).

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

1139638500 is a wasteful number, since it uses less digits than its factorization.

1139638500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 1139638500 is about 33758.5322548241. The cubic root of 1139638500 is about 1044.5334944528.

The spelling of 1139638500 in words is "one billion, one hundred thirty-nine million, six hundred thirty-eight thousand, five hundred".