13988818 has 4 divisors (see below), whose sum is σ = 20983230. Its totient is φ = 6994408.

The previous prime is 13988813. The next prime is 13988827. The reversal of 13988818 is 81888931.

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

It can be written as a sum of positive squares in only one way, i.e., 9591409 + 4397409 = 3097^2 + 2097^2 .

It is not an unprimeable number, because it can be changed into a prime (13988813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3497203 + ... + 3497206.

Almost surely, 2^13988818 is an apocalyptic number.

13988818 is a deficient number, since it is larger than the sum of its proper divisors (6994412).

13988818 is an equidigital number, since it uses as much as digits as its factorization.

13988818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6994411.

The product of its digits is 110592, while the sum is 46.

The square root of 13988818 is about 3740.1628306800. The cubic root of 13988818 is about 240.9500421576.

The spelling of 13988818 in words is "thirteen million, nine hundred eighty-eight thousand, eight hundred eighteen".