18046993 has 8 divisors (see below), whose sum is σ = 18429120. Its totient is φ = 17668560.

The previous prime is 18046981. The next prime is 18046999. The reversal of 18046993 is 39964081.

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 18046993 - 2⁹ = 18046481 is a prime.

It is a super-3 number, since 3×18046993³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18046999) 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, 10338 + ... + 11956.

It is an arithmetic number, because the mean of its divisors is an integer number (2303640).

Almost surely, 2^18046993 is an apocalyptic number.

It is an amenable number.

18046993 is a deficient number, since it is larger than the sum of its proper divisors (382127).

18046993 is a wasteful number, since it uses less digits than its factorization.

18046993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 18046993 is about 4248.1752553302. The cubic root of 18046993 is about 262.3020088278.

The spelling of 18046993 in words is "eighteen million, forty-six thousand, nine hundred ninety-three".