15849225 has 72 divisors (see below), whose sum is σ = 33658560. Its totient is φ = 6975360.

The previous prime is 15849221. The next prime is 15849227. The reversal of 15849225 is 52294851.

It is not a de Polignac number, because 15849225 - 2² = 15849221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15849225.

It is not an unprimeable number, because it can be changed into a prime (15849221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 45502 + ... + 45848.

It is an arithmetic number, because the mean of its divisors is an integer number (467480).

Almost surely, 2^15849225 is an apocalyptic number.

15849225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15849225 is an abundant number, since it is smaller than the sum of its proper divisors (17809335).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15849225 is a wasteful number, since it uses less digits than its factorization.

15849225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 391 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 15849225 is about 3981.1085139694. The cubic root of 15849225 is about 251.1901914520.

The spelling of 15849225 in words is "fifteen million, eight hundred forty-nine thousand, two hundred twenty-five".