18942018 has 32 divisors (see below), whose sum is σ = 39747456. Its totient is φ = 6006528.

The previous prime is 18942013. The next prime is 18942073. The reversal of 18942018 is 81024981.

It is a self number, because there is not a number n which added to its sum of digits gives 18942018.

It is not an unprimeable number, because it can be changed into a prime (18942013) 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, 43530 + ... + 43962.

It is an arithmetic number, because the mean of its divisors is an integer number (1242108).

Almost surely, 2^18942018 is an apocalyptic number.

18942018 is an abundant number, since it is smaller than the sum of its proper divisors (20805438).

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

18942018 is a wasteful number, since it uses less digits than its factorization.

18942018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 18942018 is about 4352.2428700614. The cubic root of 18942018 is about 266.5684509835.

Adding to 18942018 its reverse (81024981), we get a palindrome (99966999).

The spelling of 18942018 in words is "eighteen million, nine hundred forty-two thousand, eighteen".