18641966 has 32 divisors (see below), whose sum is σ = 32997888. Its totient is φ = 7734240.

The previous prime is 18641963. The next prime is 18641977. The reversal of 18641966 is 66914681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18641963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70751 + ... + 71013.

It is an arithmetic number, because the mean of its divisors is an integer number (1031184).

Almost surely, 2^18641966 is an apocalyptic number.

18641966 is a deficient number, since it is larger than the sum of its proper divisors (14355922).

18641966 is a wasteful number, since it uses less digits than its factorization.

18641966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416.

The product of its digits is 62208, while the sum is 41.

The square root of 18641966 is about 4317.6343059597. The cubic root of 18641966 is about 265.1534224911.

The spelling of 18641966 in words is "eighteen million, six hundred forty-one thousand, nine hundred sixty-six".