16243225 has 12 divisors (see below), whose sum is σ = 20792320. Its totient is φ = 12574800.

The previous prime is 16243223. The next prime is 16243229. The reversal of 16243225 is 52234261.

It is not a de Polignac number, because 16243225 - 2¹ = 16243223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 16243225.

It is not an unprimeable number, because it can be changed into a prime (16243223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9705 + ... + 11254.

Almost surely, 2^16243225 is an apocalyptic number.

It is an amenable number.

16243225 is a deficient number, since it is larger than the sum of its proper divisors (4549095).

16243225 is a wasteful number, since it uses less digits than its factorization.

16243225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21000 (or 20995 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 16243225 is about 4030.2884512154. The cubic root of 16243225 is about 253.2546452672.

Adding to 16243225 its reverse (52234261), we get a palindrome (68477486).

The spelling of 16243225 in words is "sixteen million, two hundred forty-three thousand, two hundred twenty-five".