13213645 has 8 divisors (see below), whose sum is σ = 16691040. Its totient is φ = 10014480.

The previous prime is 13213579. The next prime is 13213667. The reversal of 13213645 is 54631231.

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

It is not a de Polignac number, because 13213645 - 2¹⁹ = 12689357 is a prime.

It is a super-3 number, since 3×13213645³ (a number of 22 digits) contains 333 as substring.

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, 69451 + ... + 69640.

It is an arithmetic number, because the mean of its divisors is an integer number (2086380).

Almost surely, 2^13213645 is an apocalyptic number.

It is an amenable number.

13213645 is a deficient number, since it is larger than the sum of its proper divisors (3477395).

13213645 is a wasteful number, since it uses less digits than its factorization.

13213645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139115.

The product of its digits is 2160, while the sum is 25.

The square root of 13213645 is about 3635.0577712053. The cubic root of 13213645 is about 236.4145555306.

Adding to 13213645 its reverse (54631231), we get a palindrome (67844876).

The spelling of 13213645 in words is "thirteen million, two hundred thirteen thousand, six hundred forty-five".