1139638440 has 64 divisors (see below), whose sum is σ = 3426111360. Its totient is φ = 303264000.

The previous prime is 1139638439. The next prime is 1139638447. The reversal of 1139638440 is 448369311.

It is not an unprimeable number, because it can be changed into a prime (1139638447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48690 + ... + 68190.

It is an arithmetic number, because the mean of its divisors is an integer number (53532990).

Almost surely, 2^1139638440 is an apocalyptic number.

1139638440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1139638440 is an abundant number, since it is smaller than the sum of its proper divisors (2286472920).

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

1139638440 is a wasteful number, since it uses less digits than its factorization.

1139638440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20002 (or 19998 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 1139638440 is about 33758.5313661599. The cubic root of 1139638440 is about 1044.5334761219.

The spelling of 1139638440 in words is "one billion, one hundred thirty-nine million, six hundred thirty-eight thousand, four hundred forty".