18373813 has 4 divisors (see below), whose sum is σ = 18476640. Its totient is φ = 18270988.

The previous prime is 18373807. The next prime is 18373829. The reversal of 18373813 is 31837381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18373813 - 2⁹ = 18373301 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 (18373613) 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, 51145 + ... + 51502.

It is an arithmetic number, because the mean of its divisors is an integer number (4619160).

Almost surely, 2^18373813 is an apocalyptic number.

It is an amenable number.

18373813 is a deficient number, since it is larger than the sum of its proper divisors (102827).

18373813 is a wasteful number, since it uses less digits than its factorization.

18373813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102826.

The product of its digits is 12096, while the sum is 34.

The square root of 18373813 is about 4286.4685931428. The cubic root of 18373813 is about 263.8759221420.

The spelling of 18373813 in words is "eighteen million, three hundred seventy-three thousand, eight hundred thirteen".