13645289 has 4 divisors (see below), whose sum is σ = 15594624. Its totient is φ = 11695956.

The previous prime is 13645259. The next prime is 13645321. The reversal of 13645289 is 98254631.

13645289 = T₁₉₇₁ + T₁₉₇₂ + ... + T₁₉₇₇.

It is a happy number.

13645289 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13645289 - 2²⁰ = 12596713 is a prime.

It is a Duffinian number.

13645289 is strictly pandigital in base 8.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13645259) 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, 974657 + ... + 974670.

It is an arithmetic number, because the mean of its divisors is an integer number (3898656).

Almost surely, 2^13645289 is an apocalyptic number.

It is an amenable number.

13645289 is a deficient number, since it is larger than the sum of its proper divisors (1949335).

13645289 is an equidigital number, since it uses as much as digits as its factorization.

13645289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949334.

The product of its digits is 51840, while the sum is 38.

The square root of 13645289 is about 3693.9530316451. The cubic root of 13645289 is about 238.9613039363.

The spelling of 13645289 in words is "thirteen million, six hundred forty-five thousand, two hundred eighty-nine".