1138722840 has 64 divisors (see below), whose sum is σ = 3795746400. Its totient is φ = 303659136.

The previous prime is 1138722811. The next prime is 1138722857. The reversal of 1138722840 is 482278311.

1138722840 is a `hidden beast` number, since 11 + 387 + 228 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1138722795 and 1138722804.

It is a congruent number.

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, 526107 + ... + 528266.

Almost surely, 2^1138722840 is an apocalyptic number.

1138722840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1138722840 is an abundant number, since it is smaller than the sum of its proper divisors (2657023560).

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

1138722840 is a wasteful number, since it uses less digits than its factorization.

1138722840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054393 (or 1054383 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 1138722840 is about 33744.9676248178. The cubic root of 1138722840 is about 1044.2536706874.

The spelling of 1138722840 in words is "one billion, one hundred thirty-eight million, seven hundred twenty-two thousand, eight hundred forty".