15994225 has 24 divisors (see below), whose sum is σ = 22107960. Its totient is φ = 11397120.

The previous prime is 15994213. The next prime is 15994247. The reversal of 15994225 is 52249951.

15994225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 2686321 + 13307904 = 1639^2 + 3648^2 .

It is not a de Polignac number, because 15994225 - 2¹⁵ = 15961457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8577 + ... + 10273.

It is an arithmetic number, because the mean of its divisors is an integer number (921165).

Almost surely, 2^15994225 is an apocalyptic number.

It is an amenable number.

15994225 is a deficient number, since it is larger than the sum of its proper divisors (6113735).

15994225 is a wasteful number, since it uses less digits than its factorization.

15994225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749 (or 1744 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 15994225 is about 3999.2780598503. The cubic root of 15994225 is about 251.9538894805.

The spelling of 15994225 in words is "fifteen million, nine hundred ninety-four thousand, two hundred twenty-five".