13671965 has 4 divisors (see below), whose sum is σ = 16406364. Its totient is φ = 10937568.

The previous prime is 13671949. The next prime is 13671967. The reversal of 13671965 is 56917631.

13671965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2735716 + 10936249 = 1654^2 + 3307^2 .

It is a cyclic number.

It is not a de Polignac number, because 13671965 - 2⁴ = 13671949 is a prime.

It is a super-2 number, since 2×13671965² = 373845253922450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13671967) 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, 1367192 + ... + 1367201.

It is an arithmetic number, because the mean of its divisors is an integer number (4101591).

Almost surely, 2^13671965 is an apocalyptic number.

It is an amenable number.

13671965 is a deficient number, since it is larger than the sum of its proper divisors (2734399).

13671965 is an equidigital number, since it uses as much as digits as its factorization.

13671965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734398.

The product of its digits is 34020, while the sum is 38.

The square root of 13671965 is about 3697.5620346385. The cubic root of 13671965 is about 239.1169225351.

The spelling of 13671965 in words is "thirteen million, six hundred seventy-one thousand, nine hundred sixty-five".