1138279723 has 8 divisors (see below), whose sum is σ = 1301096192. Its totient is φ = 975514536.

The previous prime is 1138279717. The next prime is 1138279763. The reversal of 1138279723 is 3279728311.

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 1138279723 - 2¹³ = 1138271531 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 1138279723.

It is not an unprimeable number, because it can be changed into a prime (1138279763) 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, 73636 + ... + 87742.

It is an arithmetic number, because the mean of its divisors is an integer number (162637024).

Almost surely, 2^1138279723 is an apocalyptic number.

1138279723 is a deficient number, since it is larger than the sum of its proper divisors (162816469).

1138279723 is a wasteful number, since it uses less digits than its factorization.

1138279723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25641.

The product of its digits is 127008, while the sum is 43.

The square root of 1138279723 is about 33738.4013106727. The cubic root of 1138279723 is about 1044.1182012031.

The spelling of 1138279723 in words is "one billion, one hundred thirty-eight million, two hundred seventy-nine thousand, seven hundred twenty-three".