15897139 has 4 divisors (see below), whose sum is σ = 16235424. Its totient is φ = 15558856.

The previous prime is 15897127. The next prime is 15897173. The reversal of 15897139 is 93179851.

15897139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15897139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15897095 and 15897104.

It is not an unprimeable number, because it can be changed into a prime (15897109) 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, 169072 + ... + 169165.

It is an arithmetic number, because the mean of its divisors is an integer number (4058856).

Almost surely, 2^15897139 is an apocalyptic number.

15897139 is a deficient number, since it is larger than the sum of its proper divisors (338285).

15897139 is an equidigital number, since it uses as much as digits as its factorization.

15897139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338284.

The product of its digits is 68040, while the sum is 43.

The square root of 15897139 is about 3987.1216434917. The cubic root of 15897139 is about 251.4430622582.

The spelling of 15897139 in words is "fifteen million, eight hundred ninety-seven thousand, one hundred thirty-nine".