13969 has 4 divisors (see below), whose sum is σ = 14260. Its totient is φ = 13680.

The previous prime is 13967. The next prime is 13997. The reversal of 13969 is 96931.

13969 = T₉₅ + T₉₆ + T₉₇.

It is a happy number.

13969 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 6400 + 7569 = 80^2 + 87^2 .

It is a cyclic number.

It is not a de Polignac number, because 13969 - 2¹ = 13967 is a prime.

It is a super-2 number, since 2×13969² = 390265922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (13963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54 + ... + 175.

It is an arithmetic number, because the mean of its divisors is an integer number (3565).

2¹³⁹⁶⁹ is an apocalyptic number.

13969 is the 97-th centered triangular number.

It is an amenable number.

13969 is a deficient number, since it is larger than the sum of its proper divisors (291).

13969 is an equidigital number, since it uses as much as digits as its factorization.

13969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290.

The product of its digits is 1458, while the sum is 28.

The square root of 13969 is about 118.1905241549. The cubic root of 13969 is about 24.0836203502.

It can be divided in two parts, 139 and 69, that multiplied together give a triangular number (9591 = T₁₃₈).

The spelling of 13969 in words is "thirteen thousand, nine hundred sixty-nine".