15138321 has 16 divisors (see below), whose sum is σ = 22084608. Its totient is φ = 9147600.

The previous prime is 15138311. The next prime is 15138329. The reversal of 15138321 is 12383151.

It is not a de Polignac number, because 15138321 - 2¹⁵ = 15105553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15138291 and 15138300.

It is not an unprimeable number, because it can be changed into a prime (15138329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20460 + ... + 21186.

It is an arithmetic number, because the mean of its divisors is an integer number (1380288).

Almost surely, 2^15138321 is an apocalyptic number.

15138321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15138321 is a deficient number, since it is larger than the sum of its proper divisors (6946287).

15138321 is a wasteful number, since it uses less digits than its factorization.

15138321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372.

The product of its digits is 720, while the sum is 24.

The square root of 15138321 is about 3890.7995322298. The cubic root of 15138321 is about 247.3769534269.

The spelling of 15138321 in words is "fifteen million, one hundred thirty-eight thousand, three hundred twenty-one".