13720018 has 16 divisors (see below), whose sum is σ = 22251096. Its totient is φ = 6307200.

The previous prime is 13720001. The next prime is 13720039. The reversal of 13720018 is 81002731.

13720018 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 4 ways, for example, as 10323369 + 3396649 = 3213^2 + 1843^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6718 + ... + 8518.

Almost surely, 2^13720018 is an apocalyptic number.

13720018 is a deficient number, since it is larger than the sum of its proper divisors (8531078).

13720018 is a wasteful number, since it uses less digits than its factorization.

13720018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 13720018 is about 3704.0542652612. The cubic root of 13720018 is about 239.3967372271.

Adding to 13720018 its reverse (81002731), we get a palindrome (94722749).

The spelling of 13720018 in words is "thirteen million, seven hundred twenty thousand, eighteen".