13643289 has 32 divisors (see below), whose sum is σ = 22394880. Its totient is φ = 8139600.

The previous prime is 13643261. The next prime is 13643293. The reversal of 13643289 is 98234631.

13643289 is a `hidden beast` number, since 1 + 3 + 643 + 2 + 8 + 9 = 666.

It is not a de Polignac number, because 13643289 - 2¹⁵ = 13610521 is a prime.

It is a super-2 number, since 2×13643289² = 372278669475042, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13643239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20764 + ... + 21410.

It is an arithmetic number, because the mean of its divisors is an integer number (699840).

Almost surely, 2^13643289 is an apocalyptic number.

It is an amenable number.

13643289 is a deficient number, since it is larger than the sum of its proper divisors (8751591).

13643289 is a wasteful number, since it uses less digits than its factorization.

13643289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 732 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 13643289 is about 3693.6823090244. The cubic root of 13643289 is about 238.9496284547.

The spelling of 13643289 in words is "thirteen million, six hundred forty-three thousand, two hundred eighty-nine".