18664746 has 8 divisors (see below), whose sum is σ = 37329504. Its totient is φ = 6221580.

The previous prime is 18664729. The next prime is 18664747. The reversal of 18664746 is 64746681.

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

18664746 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18664698 and 18664707.

It is not an unprimeable number, because it can be changed into a prime (18664747) 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, 1555390 + ... + 1555401.

It is an arithmetic number, because the mean of its divisors is an integer number (4666188).

Almost surely, 2^18664746 is an apocalyptic number.

18664746 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18664746 is a wasteful number, since it uses less digits than its factorization.

18664746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110796.

The product of its digits is 193536, while the sum is 42.

The square root of 18664746 is about 4320.2715192451. The cubic root of 18664746 is about 265.2613820685.

The spelling of 18664746 in words is "eighteen million, six hundred sixty-four thousand, seven hundred forty-six".