15894121 has 4 divisors (see below), whose sum is σ = 15913044. Its totient is φ = 15875200.

The previous prime is 15894119. The next prime is 15894181. The reversal of 15894121 is 12149851.

It is a happy number.

15894121 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 can be written as a sum of positive squares in 2 ways, for example, as 1537600 + 14356521 = 1240^2 + 3789^2 .

It is a cyclic number.

It is not a de Polignac number, because 15894121 - 2¹ = 15894119 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a deceptive number, since it divides R_15894120.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15894181) 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, 8140 + ... + 9901.

It is an arithmetic number, because the mean of its divisors is an integer number (3978261).

Almost surely, 2^15894121 is an apocalyptic number.

It is an amenable number.

15894121 is a deficient number, since it is larger than the sum of its proper divisors (18923).

15894121 is an equidigital number, since it uses as much as digits as its factorization.

15894121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18922.

The product of its digits is 2880, while the sum is 31.

The square root of 15894121 is about 3986.7431570143. The cubic root of 15894121 is about 251.4271494748.

The spelling of 15894121 in words is "fifteen million, eight hundred ninety-four thousand, one hundred twenty-one".