15998265 has 12 divisors (see below), whose sum is σ = 27730404. Its totient is φ = 8532384.

The previous prime is 15998251. The next prime is 15998267. The reversal of 15998265 is 56289951.

It can be written as a sum of positive squares in 2 ways, for example, as 9511056 + 6487209 = 3084^2 + 2547^2 .

It is not a de Polignac number, because 15998265 - 2⁴ = 15998249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 355517 = 15998265 / (1 + 5 + 9 + 9 + 8 + 2 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 15998265.

It is not an unprimeable number, because it can be changed into a prime (15998267) 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 11 ways as a sum of consecutive naturals, for example, 177714 + ... + 177803.

It is an arithmetic number, because the mean of its divisors is an integer number (2310867).

Almost surely, 2^15998265 is an apocalyptic number.

15998265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15998265 is a deficient number, since it is larger than the sum of its proper divisors (11732139).

15998265 is a wasteful number, since it uses less digits than its factorization.

15998265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355528 (or 355525 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 15998265 is about 3999.7831191203. The cubic root of 15998265 is about 251.9751014705.

The spelling of 15998265 in words is "fifteen million, nine hundred ninety-eight thousand, two hundred sixty-five".