15138859 has 4 divisors (see below), whose sum is σ = 15215904. Its totient is φ = 15061816.

The previous prime is 15138821. The next prime is 15138863. The reversal of 15138859 is 95883151.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15138859 - 2⁷ = 15138731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15138259) 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, 38227 + ... + 38620.

It is an arithmetic number, because the mean of its divisors is an integer number (3803976).

Almost surely, 2^15138859 is an apocalyptic number.

15138859 is a deficient number, since it is larger than the sum of its proper divisors (77045).

15138859 is an equidigital number, since it uses as much as digits as its factorization.

15138859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77044.

The product of its digits is 43200, while the sum is 40.

The square root of 15138859 is about 3890.8686690764. The cubic root of 15138859 is about 247.3798838977.

The spelling of 15138859 in words is "fifteen million, one hundred thirty-eight thousand, eight hundred fifty-nine".