18089813 has 8 divisors (see below), whose sum is σ = 21024960. Its totient is φ = 15242400.

The previous prime is 18089809. The next prime is 18089839. The reversal of 18089813 is 31898081.

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

It is a cyclic number.

It is not a de Polignac number, because 18089813 - 2² = 18089809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18089803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21488 + ... + 22313.

It is an arithmetic number, because the mean of its divisors is an integer number (2628120).

Almost surely, 2^18089813 is an apocalyptic number.

It is an amenable number.

18089813 is a deficient number, since it is larger than the sum of its proper divisors (2935147).

18089813 is an equidigital number, since it uses as much as digits as its factorization.

18089813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43867.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 18089813 is about 4253.2120802988. The cubic root of 18089813 is about 262.5092991415.

The spelling of 18089813 in words is "eighteen million, eighty-nine thousand, eight hundred thirteen".