13638398 has 4 divisors (see below), whose sum is σ = 20457600. Its totient is φ = 6819198.

The previous prime is 13638397. The next prime is 13638421. The reversal of 13638398 is 89383631.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3409598 + ... + 3409601.

It is an arithmetic number, because the mean of its divisors is an integer number (5114400).

Almost surely, 2^13638398 is an apocalyptic number.

13638398 is a deficient number, since it is larger than the sum of its proper divisors (6819202).

13638398 is an equidigital number, since it uses as much as digits as its factorization.

13638398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6819201.

The product of its digits is 93312, while the sum is 41.

The square root of 13638398 is about 3693.0201732457. The cubic root of 13638398 is about 238.9210712567.

The spelling of 13638398 in words is "thirteen million, six hundred thirty-eight thousand, three hundred ninety-eight".