13215765 has 32 divisors (see below), whose sum is σ = 22127616. Its totient is φ = 6727680.

The previous prime is 13215751. The next prime is 13215767. The reversal of 13215765 is 56751231.

It is not a de Polignac number, because 13215765 - 2¹⁰ = 13214741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44959 + ... + 45251.

It is an arithmetic number, because the mean of its divisors is an integer number (691488).

Almost surely, 2^13215765 is an apocalyptic number.

13215765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13215765 is a deficient number, since it is larger than the sum of its proper divisors (8911851).

13215765 is a wasteful number, since it uses less digits than its factorization.

13215765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429.

The product of its digits is 6300, while the sum is 30.

The square root of 13215765 is about 3635.3493642290. The cubic root of 13215765 is about 236.4271983216.

Adding to 13215765 its reverse (56751231), we get a palindrome (69966996).

The spelling of 13215765 in words is "thirteen million, two hundred fifteen thousand, seven hundred sixty-five".