13638819 has 8 divisors (see below), whose sum is σ = 18316480. Its totient is φ = 9026856.

The previous prime is 13638817. The next prime is 13638881. The reversal of 13638819 is 91883631.

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

It is not a de Polignac number, because 13638819 - 2¹ = 13638817 is a prime.

It is a super-2 number, since 2×13638819² = 372034767429522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13638817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15937 + ... + 16770.

It is an arithmetic number, because the mean of its divisors is an integer number (2289560).

Almost surely, 2^13638819 is an apocalyptic number.

13638819 is a deficient number, since it is larger than the sum of its proper divisors (4677661).

13638819 is a wasteful number, since it uses less digits than its factorization.

13638819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32849.

The product of its digits is 31104, while the sum is 39.

The square root of 13638819 is about 3693.0771722237. The cubic root of 13638819 is about 238.9235296279.

The spelling of 13638819 in words is "thirteen million, six hundred thirty-eight thousand, eight hundred nineteen".