18333997 has 4 divisors (see below), whose sum is σ = 20000736. Its totient is φ = 16667260.

The previous prime is 18333983. The next prime is 18334009. The reversal of 18333997 is 79933381.

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 18333997 - 2⁷ = 18333869 is a prime.

It is a super-2 number, since 2×18333997² = 672270891992018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18333937) 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, 833353 + ... + 833374.

It is an arithmetic number, because the mean of its divisors is an integer number (5000184).

Almost surely, 2^18333997 is an apocalyptic number.

It is an amenable number.

18333997 is a deficient number, since it is larger than the sum of its proper divisors (1666739).

18333997 is a wasteful number, since it uses less digits than its factorization.

18333997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666738.

The product of its digits is 122472, while the sum is 43.

The square root of 18333997 is about 4281.8216917569. The cubic root of 18333997 is about 263.6851781732.

The spelling of 18333997 in words is "eighteen million, three hundred thirty-three thousand, nine hundred ninety-seven".