15399225 has 36 divisors (see below), whose sum is σ = 27927900. Its totient is φ = 8110080.

The previous prime is 15399187. The next prime is 15399257. The reversal of 15399225 is 52299351.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1937664 + 13461561 = 1392^2 + 3669^2 .

It is not a de Polignac number, because 15399225 - 2⁸ = 15398969 is a prime.

It is a super-2 number, since 2×15399225² = 474272261201250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15399225.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19641 + ... + 20409.

It is an arithmetic number, because the mean of its divisors is an integer number (775775).

Almost surely, 2^15399225 is an apocalyptic number.

15399225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15399225 is a deficient number, since it is larger than the sum of its proper divisors (12528675).

15399225 is a wasteful number, since it uses less digits than its factorization.

15399225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 866 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 15399225 is about 3924.1846286840. The cubic root of 15399225 is about 248.7900199072.

The spelling of 15399225 in words is "fifteen million, three hundred ninety-nine thousand, two hundred twenty-five".