1138722839 has 8 divisors (see below), whose sum is σ = 1215077040. Its totient is φ = 1064010816.

The previous prime is 1138722811. The next prime is 1138722857. The reversal of 1138722839 is 9382278311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1138722839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1138722839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138722859) 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, 409112 + ... + 411885.

It is an arithmetic number, because the mean of its divisors is an integer number (151884630).

Almost surely, 2^1138722839 is an apocalyptic number.

1138722839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1138722839 is a deficient number, since it is larger than the sum of its proper divisors (76354201).

1138722839 is an equidigital number, since it uses as much as digits as its factorization.

1138722839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821089.

The product of its digits is 145152, while the sum is 44.

The square root of 1138722839 is about 33744.9676100008. The cubic root of 1138722839 is about 1044.2536703818.

The spelling of 1138722839 in words is "one billion, one hundred thirty-eight million, seven hundred twenty-two thousand, eight hundred thirty-nine".