18733813 has 8 divisors (see below), whose sum is σ = 22669632. Its totient is φ = 15112896.

The previous prime is 18733811. The next prime is 18733817. The reversal of 18733813 is 31833781.

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 18733813 - 2¹ = 18733811 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 (18733811) 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, 78595 + ... + 78832.

It is an arithmetic number, because the mean of its divisors is an integer number (2833704).

Almost surely, 2^18733813 is an apocalyptic number.

It is an amenable number.

18733813 is a deficient number, since it is larger than the sum of its proper divisors (3935819).

18733813 is a wasteful number, since it uses less digits than its factorization.

18733813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157451.

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

The square root of 18733813 is about 4328.2575015819. The cubic root of 18733813 is about 265.5881702662.

The spelling of 18733813 in words is "eighteen million, seven hundred thirty-three thousand, eight hundred thirteen".