15138923 has 4 divisors (see below), whose sum is σ = 15166008. Its totient is φ = 15111840.

The previous prime is 15138917. The next prime is 15138941. The reversal of 15138923 is 32983151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32983151 = 4877 ⋅6763.

It is a cyclic number.

It is not a de Polignac number, because 15138923 - 2¹² = 15134827 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 15138923.

It is not an unprimeable number, because it can be changed into a prime (15138913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12686 + ... + 13827.

It is an arithmetic number, because the mean of its divisors is an integer number (3791502).

Almost surely, 2^15138923 is an apocalyptic number.

15138923 is a deficient number, since it is larger than the sum of its proper divisors (27085).

15138923 is an equidigital number, since it uses as much as digits as its factorization.

15138923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27084.

The product of its digits is 6480, while the sum is 32.

The square root of 15138923 is about 3890.8768934522. The cubic root of 15138923 is about 247.3802324993.

It can be divided in two parts, 15138 and 923, that added together give a palindrome (16061).

The spelling of 15138923 in words is "fifteen million, one hundred thirty-eight thousand, nine hundred twenty-three".