15138723 has 8 divisors (see below), whose sum is σ = 20364048. Its totient is φ = 10002944.

The previous prime is 15138719. The next prime is 15138731. The reversal of 15138723 is 32783151.

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 15138723 - 2² = 15138719 is a prime.

It is a super-3 number, since 3×15138723³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (15138733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21990 + ... + 22667.

It is an arithmetic number, because the mean of its divisors is an integer number (2545506).

Almost surely, 2^15138723 is an apocalyptic number.

15138723 is a deficient number, since it is larger than the sum of its proper divisors (5225325).

15138723 is a wasteful number, since it uses less digits than its factorization.

15138723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44773.

The product of its digits is 5040, while the sum is 30.

The square root of 15138723 is about 3890.8511922200. The cubic root of 15138723 is about 247.3791431161.

Adding to 15138723 its sum of digits (30), we get a triangular number (15138753 = T₅₅₀₂).

The spelling of 15138723 in words is "fifteen million, one hundred thirty-eight thousand, seven hundred twenty-three".