18034813 has 4 divisors (see below), whose sum is σ = 18200380. Its totient is φ = 17869248.

The previous prime is 18034801. The next prime is 18034837. The reversal of 18034813 is 31843081.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4507129 + 13527684 = 2123^2 + 3678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18034813 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 (18034843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82620 + ... + 82837.

It is an arithmetic number, because the mean of its divisors is an integer number (4550095).

Almost surely, 2^18034813 is an apocalyptic number.

It is an amenable number.

18034813 is a deficient number, since it is larger than the sum of its proper divisors (165567).

18034813 is a wasteful number, since it uses less digits than its factorization.

18034813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165566.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18034813 is about 4246.7414566936. The cubic root of 18034813 is about 262.2429859299.

Adding to 18034813 its reverse (31843081), we get a palindrome (49877894).

The spelling of 18034813 in words is "eighteen million, thirty-four thousand, eight hundred thirteen".