15138889 has 4 divisors (see below), whose sum is σ = 15175440. Its totient is φ = 15102340.

The previous prime is 15138863. The next prime is 15138913. The reversal of 15138889 is 98883151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15138889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15138689) 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, 17647 + ... + 18484.

It is an arithmetic number, because the mean of its divisors is an integer number (3793860).

Almost surely, 2^15138889 is an apocalyptic number.

It is an amenable number.

15138889 is a deficient number, since it is larger than the sum of its proper divisors (36551).

15138889 is an equidigital number, since it uses as much as digits as its factorization.

15138889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36550.

The product of its digits is 69120, while the sum is 43.

The square root of 15138889 is about 3890.8725242547. The cubic root of 15138889 is about 247.3800473049.

The spelling of 15138889 in words is "fifteen million, one hundred thirty-eight thousand, eight hundred eighty-nine".