18662642 has 4 divisors (see below), whose sum is σ = 27993966. Its totient is φ = 9331320.

The previous prime is 18662641. The next prime is 18662659. The reversal of 18662642 is 24626681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18241441 + 421201 = 4271^2 + 649^2 .

It is not an unprimeable number, because it can be changed into a prime (18662641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4665659 + ... + 4665662.

Almost surely, 2^18662642 is an apocalyptic number.

18662642 is a deficient number, since it is larger than the sum of its proper divisors (9331324).

18662642 is an equidigital number, since it uses as much as digits as its factorization.

18662642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9331323.

The product of its digits is 27648, while the sum is 35.

The square root of 18662642 is about 4320.0280091685. The cubic root of 18662642 is about 265.2514144193.

The spelling of 18662642 in words is "eighteen million, six hundred sixty-two thousand, six hundred forty-two".