13913618 has 4 divisors (see below), whose sum is σ = 20870430. Its totient is φ = 6956808.

The previous prime is 13913611. The next prime is 13913621. The reversal of 13913618 is 81631931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81631931 = 43 ⋅1898417.

It can be written as a sum of positive squares in only one way, i.e., 9406489 + 4507129 = 3067^2 + 2123^2 .

It is not an unprimeable number, because it can be changed into a prime (13913611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3478403 + ... + 3478406.

Almost surely, 2^13913618 is an apocalyptic number.

13913618 is a deficient number, since it is larger than the sum of its proper divisors (6956812).

13913618 is an equidigital number, since it uses as much as digits as its factorization.

13913618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6956811.

The product of its digits is 3888, while the sum is 32.

The square root of 13913618 is about 3730.0962454071. The cubic root of 13913618 is about 240.5175059979.

The spelling of 13913618 in words is "thirteen million, nine hundred thirteen thousand, six hundred eighteen".