13917818 has 4 divisors (see below), whose sum is σ = 20876730. Its totient is φ = 6958908.

The previous prime is 13917779. The next prime is 13917847. The reversal of 13917818 is 81871931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81871931 = 19 ⋅4309049.

It can be written as a sum of positive squares in only one way, i.e., 10738729 + 3179089 = 3277^2 + 1783^2 .

It is a super-2 number, since 2×13917818² = 387411315762248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3479453 + ... + 3479456.

Almost surely, 2^13917818 is an apocalyptic number.

13917818 is a deficient number, since it is larger than the sum of its proper divisors (6958912).

13917818 is an equidigital number, since it uses as much as digits as its factorization.

13917818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6958911.

The product of its digits is 12096, while the sum is 38.

The square root of 13917818 is about 3730.6591910814. The cubic root of 13917818 is about 240.5417046379.

The spelling of 13917818 in words is "thirteen million, nine hundred seventeen thousand, eight hundred eighteen".