18227661 has 8 divisors (see below), whose sum is σ = 25360320. Its totient is φ = 11623392.

The previous prime is 18227653. The next prime is 18227683. The reversal of 18227661 is 16672281.

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

It is not a de Polignac number, because 18227661 - 2³ = 18227653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18227611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132016 + ... + 132153.

It is an arithmetic number, because the mean of its divisors is an integer number (3170040).

Almost surely, 2^18227661 is an apocalyptic number.

It is an amenable number.

18227661 is a deficient number, since it is larger than the sum of its proper divisors (7132659).

18227661 is a wasteful number, since it uses less digits than its factorization.

18227661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264195.

The product of its digits is 8064, while the sum is 33.

The square root of 18227661 is about 4269.3864898835. The cubic root of 18227661 is about 263.1744037355.

The spelling of 18227661 in words is "eighteen million, two hundred twenty-seven thousand, six hundred sixty-one".