1138772868 has 48 divisors (see below), whose sum is σ = 2746166976. Its totient is φ = 367037440.

The previous prime is 1138772861. The next prime is 1138772951. The reversal of 1138772868 is 8682778311.

It is a self number, because there is not a number n which added to its sum of digits gives 1138772868.

It is not an unprimeable number, because it can be changed into a prime (1138772861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45355 + ... + 65837.

It is an arithmetic number, because the mean of its divisors is an integer number (57211812).

Almost surely, 2^1138772868 is an apocalyptic number.

It is an amenable number.

1138772868 is an abundant number, since it is smaller than the sum of its proper divisors (1607394108).

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

1138772868 is a wasteful number, since it uses less digits than its factorization.

1138772868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20644 (or 20642 counting only the distinct ones).

The product of its digits is 903168, while the sum is 51.

The square root of 1138772868 is about 33745.7088827602. The cubic root of 1138772868 is about 1044.2689630120.

It can be divided in two parts, 11387 and 72868, that added together give a triangular number (84255 = T₄₁₀).

The spelling of 1138772868 in words is "one billion, one hundred thirty-eight million, seven hundred seventy-two thousand, eight hundred sixty-eight".