15724225 has 12 divisors (see below), whose sum is σ = 21270960. Its totient is φ = 11435600.

The previous prime is 15724217. The next prime is 15724237. The reversal of 15724225 is 52242751.

It is not a de Polignac number, because 15724225 - 2³ = 15724217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15724193 and 15724202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28315 + ... + 28864.

It is an arithmetic number, because the mean of its divisors is an integer number (1772580).

Almost surely, 2^15724225 is an apocalyptic number.

It is an amenable number.

15724225 is a deficient number, since it is larger than the sum of its proper divisors (5546735).

15724225 is a wasteful number, since it uses less digits than its factorization.

15724225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57200 (or 57195 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 15724225 is about 3965.3782921684. The cubic root of 15724225 is about 250.5280837249.

Adding to 15724225 its reverse (52242751), we get a palindrome (67966976).

The spelling of 15724225 in words is "fifteen million, seven hundred twenty-four thousand, two hundred twenty-five".