18640002 has 8 divisors (see below), whose sum is σ = 37280016. Its totient is φ = 6213332.

The previous prime is 18640001. The next prime is 18640009. The reversal of 18640002 is 20004681.

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

18640002 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18640001) 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, 1553328 + ... + 1553339.

It is an arithmetic number, because the mean of its divisors is an integer number (4660002).

Almost surely, 2^18640002 is an apocalyptic number.

18640002 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.

18640002 is a wasteful number, since it uses less digits than its factorization.

18640002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106672.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18640002 is about 4317.4068606051. The cubic root of 18640002 is about 265.1441105331.

Adding to 18640002 its reverse (20004681), we get a palindrome (38644683).

The spelling of 18640002 in words is "eighteen million, six hundred forty thousand, two".