18213006 has 24 divisors (see below), whose sum is σ = 42373800. Its totient is φ = 5203632.

The previous prime is 18212993. The next prime is 18213007. The reversal of 18213006 is 60031281.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30681 + ... + 31268.

It is an arithmetic number, because the mean of its divisors is an integer number (1765575).

Almost surely, 2^18213006 is an apocalyptic number.

18213006 is an abundant number, since it is smaller than the sum of its proper divisors (24160794).

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

18213006 is a wasteful number, since it uses less digits than its factorization.

18213006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61968 (or 61961 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 18213006 is about 4267.6698560221. The cubic root of 18213006 is about 263.1038542746.

Adding to 18213006 its reverse (60031281), we get a palindrome (78244287).

The spelling of 18213006 in words is "eighteen million, two hundred thirteen thousand, six".