13640765 has 16 divisors (see below), whose sum is σ = 17371200. Its totient is φ = 10253952.

The previous prime is 13640747. The next prime is 13640777. The reversal of 13640765 is 56704631.

13640765 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13640765 - 2⁸ = 13640509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12689 + ... + 13721.

It is an arithmetic number, because the mean of its divisors is an integer number (1085700).

Almost surely, 2^13640765 is an apocalyptic number.

It is an amenable number.

13640765 is a deficient number, since it is larger than the sum of its proper divisors (3730435).

13640765 is a wasteful number, since it uses less digits than its factorization.

13640765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 13640765 is about 3693.3406287533. The cubic root of 13640765 is about 238.9348923683.

The spelling of 13640765 in words is "thirteen million, six hundred forty thousand, seven hundred sixty-five".