13643645 has 8 divisors (see below), whose sum is σ = 16468056. Its totient is φ = 10851136.

The previous prime is 13643633. The next prime is 13643683. The reversal of 13643645 is 54634631.

13643645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4414201 + 9229444 = 2101^2 + 3038^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13643645 - 2¹⁴ = 13627261 is a prime.

It is a super-2 number, since 2×13643645² = 372298097772050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7022 + ... + 8751.

It is an arithmetic number, because the mean of its divisors is an integer number (2058507).

Almost surely, 2^13643645 is an apocalyptic number.

It is an amenable number.

13643645 is a deficient number, since it is larger than the sum of its proper divisors (2824411).

13643645 is a wasteful number, since it uses less digits than its factorization.

13643645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15951.

The product of its digits is 25920, while the sum is 32.

The square root of 13643645 is about 3693.7304991025. The cubic root of 13643645 is about 238.9517067739.

The spelling of 13643645 in words is "thirteen million, six hundred forty-three thousand, six hundred forty-five".