1139155864 has 32 divisors (see below), whose sum is σ = 2662963200. Its totient is φ = 443826720.

The previous prime is 1139155861. The next prime is 1139155867. The reversal of 1139155864 is 4685519311.

It is an interprime number because it is at equal distance from previous prime (1139155861) and next prime (1139155867).

It is a self number, because there is not a number n which added to its sum of digits gives 1139155864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139155861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924024 + ... + 925255.

It is an arithmetic number, because the mean of its divisors is an integer number (83217600).

Almost surely, 2^1139155864 is an apocalyptic number.

1139155864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1139155864 is an abundant number, since it is smaller than the sum of its proper divisors (1523807336).

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

1139155864 is a wasteful number, since it uses less digits than its factorization.

1139155864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849303 (or 1849299 counting only the distinct ones).

The product of its digits is 129600, while the sum is 43.

The square root of 1139155864 is about 33751.3831420284. The cubic root of 1139155864 is about 1044.3860205973.

The spelling of 1139155864 in words is "one billion, one hundred thirty-nine million, one hundred fifty-five thousand, eight hundred sixty-four".