13851965 has 4 divisors (see below), whose sum is σ = 16622364. Its totient is φ = 11081568.

The previous prime is 13851883. The next prime is 13851967. The reversal of 13851965 is 56915831.

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 6744409 + 7107556 = 2597^2 + 2666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13851965 is a prime.

It is a super-2 number, since 2×13851965² = 383753868722450, 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 (13851967) 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, 1385192 + ... + 1385201.

It is an arithmetic number, because the mean of its divisors is an integer number (4155591).

Almost surely, 2^13851965 is an apocalyptic number.

It is an amenable number.

13851965 is a deficient number, since it is larger than the sum of its proper divisors (2770399).

13851965 is an equidigital number, since it uses as much as digits as its factorization.

13851965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2770398.

The product of its digits is 32400, while the sum is 38.

The square root of 13851965 is about 3721.8228060992. The cubic root of 13851965 is about 240.1617254865.

The spelling of 13851965 in words is "thirteen million, eight hundred fifty-one thousand, nine hundred sixty-five".