13439765 has 4 divisors (see below), whose sum is σ = 16127724. Its totient is φ = 10751808.

The previous prime is 13439761. The next prime is 13439773. The reversal of 13439765 is 56793431.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9084196 + 4355569 = 3014^2 + 2087^2 .

It is a cyclic number.

It is not a de Polignac number, because 13439765 - 2² = 13439761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13439761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1343972 + ... + 1343981.

It is an arithmetic number, because the mean of its divisors is an integer number (4031931).

Almost surely, 2^13439765 is an apocalyptic number.

It is an amenable number.

13439765 is a deficient number, since it is larger than the sum of its proper divisors (2687959).

13439765 is an equidigital number, since it uses as much as digits as its factorization.

13439765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687958.

The product of its digits is 68040, while the sum is 38.

The square root of 13439765 is about 3666.0285050719. The cubic root of 13439765 is about 237.7554923667.

The spelling of 13439765 in words is "thirteen million, four hundred thirty-nine thousand, seven hundred sixty-five".