18021662 has 8 divisors (see below), whose sum is σ = 27111000. Its totient is φ = 8984664.

The previous prime is 18021637. The next prime is 18021667. The reversal of 18021662 is 26612081.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021667) 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, 12212 + ... + 13607.

It is an arithmetic number, because the mean of its divisors is an integer number (3388875).

Almost surely, 2^18021662 is an apocalyptic number.

18021662 is a deficient number, since it is larger than the sum of its proper divisors (9089338).

18021662 is a wasteful number, since it uses less digits than its factorization.

18021662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26170.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18021662 is about 4245.1928106978. The cubic root of 18021662 is about 262.1792278318.

The spelling of 18021662 in words is "eighteen million, twenty-one thousand, six hundred sixty-two".