18264890 has 64 divisors (see below), whose sum is σ = 40919040. Its totient is φ = 5728320.

The previous prime is 18264881. The next prime is 18264893. The reversal of 18264890 is 9846281.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (18264893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41009 + ... + 41451.

It is an arithmetic number, because the mean of its divisors is an integer number (639360).

Almost surely, 2^18264890 is an apocalyptic number.

18264890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18264890 is an abundant number, since it is smaller than the sum of its proper divisors (22654150).

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

18264890 is a wasteful number, since it uses less digits than its factorization.

18264890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 18264890 is about 4273.7442600137. The cubic root of 18264890 is about 263.3534549954.

The spelling of 18264890 in words is "eighteen million, two hundred sixty-four thousand, eight hundred ninety".