1138999823 has 8 divisors (see below), whose sum is σ = 1259767488. Its totient is φ = 1022968224.

The previous prime is 1138999819. The next prime is 1138999871. The reversal of 1138999823 is 3289998311.

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

It is a cyclic number.

It is not a de Polignac number, because 1138999823 - 2² = 1138999819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138999223) 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, 1183511 + ... + 1184472.

It is an arithmetic number, because the mean of its divisors is an integer number (157470936).

Almost surely, 2^1138999823 is an apocalyptic number.

1138999823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1138999823 is a deficient number, since it is larger than the sum of its proper divisors (120767665).

1138999823 is a wasteful number, since it uses less digits than its factorization.

1138999823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368033.

The product of its digits is 839808, while the sum is 53.

The square root of 1138999823 is about 33749.0714390781. The cubic root of 1138999823 is about 1044.3383319283.

The spelling of 1138999823 in words is "one billion, one hundred thirty-eight million, nine hundred ninety-nine thousand, eight hundred twenty-three".