18492221 has 8 divisors (see below), whose sum is σ = 20231904. Its totient is φ = 16762320.

The previous prime is 18492217. The next prime is 18492223. The reversal of 18492221 is 12229481.

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 18492221 - 2² = 18492217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18492223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1850 + ... + 6356.

It is an arithmetic number, because the mean of its divisors is an integer number (2528988).

Almost surely, 2^18492221 is an apocalyptic number.

18492221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18492221 is a deficient number, since it is larger than the sum of its proper divisors (1739683).

18492221 is a wasteful number, since it uses less digits than its factorization.

18492221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4891.

The product of its digits is 2304, while the sum is 29.

The square root of 18492221 is about 4300.2582480591. The cubic root of 18492221 is about 264.4415485420.

The spelling of 18492221 in words is "eighteen million, four hundred ninety-two thousand, two hundred twenty-one".