13219685 has 8 divisors (see below), whose sum is σ = 15945336. Its totient is φ = 10521280.

The previous prime is 13219667. The next prime is 13219691. The reversal of 13219685 is 58691231.

It can be written as a sum of positive squares in 4 ways, for example, as 8300161 + 4919524 = 2881^2 + 2218^2 .

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

It is not a de Polignac number, because 13219685 - 2¹⁶ = 13154149 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

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, 5726 + ... + 7695.

It is an arithmetic number, because the mean of its divisors is an integer number (1993167).

Almost surely, 2^13219685 is an apocalyptic number.

It is an amenable number.

13219685 is a deficient number, since it is larger than the sum of its proper divisors (2725651).

13219685 is a wasteful number, since it uses less digits than its factorization.

13219685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13623.

The product of its digits is 12960, while the sum is 35.

The square root of 13219685 is about 3635.8884746373. Note that the first 3 decimals coincide. The cubic root of 13219685 is about 236.4505719969.

The spelling of 13219685 in words is "thirteen million, two hundred nineteen thousand, six hundred eighty-five".