18046821 has 8 divisors (see below), whose sum is σ = 25913440. Its totient is φ = 11105712.

The previous prime is 18046817. The next prime is 18046823. The reversal of 18046821 is 12864081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18046821 - 2² = 18046817 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 (18046823) 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, 231331 + ... + 231408.

It is an arithmetic number, because the mean of its divisors is an integer number (3239180).

Almost surely, 2^18046821 is an apocalyptic number.

It is an amenable number.

18046821 is a deficient number, since it is larger than the sum of its proper divisors (7866619).

18046821 is a wasteful number, since it uses less digits than its factorization.

18046821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462755.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18046821 is about 4248.1550112961. The cubic root of 18046821 is about 262.3011755202.

The spelling of 18046821 in words is "eighteen million, forty-six thousand, eight hundred twenty-one".