13639918 has 8 divisors (see below), whose sum is σ = 21165480. Its totient is φ = 6584760.

The previous prime is 13639867. The next prime is 13639919. The reversal of 13639918 is 81993631.

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

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13639919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117528 + ... + 117643.

It is an arithmetic number, because the mean of its divisors is an integer number (2645685).

Almost surely, 2^13639918 is an apocalyptic number.

13639918 is a deficient number, since it is larger than the sum of its proper divisors (7525562).

13639918 is a wasteful number, since it uses less digits than its factorization.

13639918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235202.

The product of its digits is 34992, while the sum is 40.

The square root of 13639918 is about 3693.2259611348. The cubic root of 13639918 is about 238.9299468480.

The spelling of 13639918 in words is "thirteen million, six hundred thirty-nine thousand, nine hundred eighteen".