18818033 has 8 divisors (see below), whose sum is σ = 20301288. Its totient is φ = 17339904.

The previous prime is 18818029. The next prime is 18818069. The reversal of 18818033 is 33081881.

It can be written as a sum of positive squares in 4 ways, for example, as 908209 + 17909824 = 953^2 + 4232^2 .

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 18818033 - 2² = 18818029 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18818083) 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, 10241 + ... + 11937.

It is an arithmetic number, because the mean of its divisors is an integer number (2537661).

Almost surely, 2^18818033 is an apocalyptic number.

18818033 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18818033 is a deficient number, since it is larger than the sum of its proper divisors (1483255).

18818033 is a wasteful number, since it uses less digits than its factorization.

18818033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18818033 is about 4337.9756799687. The cubic root of 18818033 is about 265.9855693455.

The spelling of 18818033 in words is "eighteen million, eight hundred eighteen thousand, thirty-three".