1138172943 has 4 divisors (see below), whose sum is σ = 1517563928. Its totient is φ = 758781960.

The previous prime is 1138172923. The next prime is 1138172957. The reversal of 1138172943 is 3492718311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3492718311 = 3 ⋅1164239437.

It is not a de Polignac number, because 1138172943 - 2⁶ = 1138172879 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 (1138172923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189695488 + ... + 189695493.

It is an arithmetic number, because the mean of its divisors is an integer number (379390982).

Almost surely, 2^1138172943 is an apocalyptic number.

1138172943 is a deficient number, since it is larger than the sum of its proper divisors (379390985).

1138172943 is an equidigital number, since it uses as much as digits as its factorization.

1138172943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379390984.

The product of its digits is 36288, while the sum is 39.

The square root of 1138172943 is about 33736.8188037936. The cubic root of 1138172943 is about 1044.0855512239.

The spelling of 1138172943 in words is "one billion, one hundred thirty-eight million, one hundred seventy-two thousand, nine hundred forty-three".