13409965 has 4 divisors (see below), whose sum is σ = 16091964. Its totient is φ = 10727968.

The previous prime is 13409951. The next prime is 13409969. The reversal of 13409965 is 56990431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56990431 = 31 ⋅1838401.

It can be written as a sum of positive squares in 2 ways, for example, as 1590121 + 11819844 = 1261^2 + 3438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13409965 is a prime.

It is a super-2 number, since 2×13409965² = 359654322602450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13409969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1340992 + ... + 1341001.

It is an arithmetic number, because the mean of its divisors is an integer number (4022991).

Almost surely, 2^13409965 is an apocalyptic number.

It is an amenable number.

13409965 is a deficient number, since it is larger than the sum of its proper divisors (2681999).

13409965 is an equidigital number, since it uses as much as digits as its factorization.

13409965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681998.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 13409965 is about 3661.9619058641. The cubic root of 13409965 is about 237.5796371901.

It can be divided in two parts, 1 and 3409965, that added together give a triangular number (3409966 = T₂₆₁₁).

The spelling of 13409965 in words is "thirteen million, four hundred nine thousand, nine hundred sixty-five".