13720418 has 8 divisors (see below), whose sum is σ = 20812140. Its totient is φ = 6783040.

The previous prime is 13720417. The next prime is 13720433. The reversal of 13720418 is 81402731.

13720418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13446889 + 273529 = 3667^2 + 523^2 .

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

It is not an unprimeable number, because it can be changed into a prime (13720417) 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, 38363 + ... + 38718.

Almost surely, 2^13720418 is an apocalyptic number.

13720418 is a deficient number, since it is larger than the sum of its proper divisors (7091722).

13720418 is an equidigital number, since it uses as much as digits as its factorization.

13720418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77172.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 13720418 is about 3704.1082597570. The cubic root of 13720418 is about 239.3990637003.

The spelling of 13720418 in words is "thirteen million, seven hundred twenty thousand, four hundred eighteen".