13638247 has 8 divisors (see below), whose sum is σ = 15630336. Its totient is φ = 11657112.

The previous prime is 13638239. The next prime is 13638253. The reversal of 13638247 is 74283631.

It is a happy number.

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 13638247 - 2³ = 13638239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138 + ... + 5224.

It is an arithmetic number, because the mean of its divisors is an integer number (1953792).

Almost surely, 2^13638247 is an apocalyptic number.

13638247 is a deficient number, since it is larger than the sum of its proper divisors (1992089).

13638247 is an equidigital number, since it uses as much as digits as its factorization.

13638247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5477.

The product of its digits is 24192, while the sum is 34.

The square root of 13638247 is about 3692.9997292174. Note that the first 3 decimals coincide. The cubic root of 13638247 is about 238.9201895008.

It can be divided in two parts, 136 and 38247, that added together give a palindrome (38383).

The spelling of 13638247 in words is "thirteen million, six hundred thirty-eight thousand, two hundred forty-seven".