18077189 has 16 divisors (see below), whose sum is σ = 20664000. Its totient is φ = 15676416.

The previous prime is 18077183. The next prime is 18077207. The reversal of 18077189 is 98177081.

It is a cyclic number.

It is not a de Polignac number, because 18077189 - 2⁴ = 18077173 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18077183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40037 + ... + 40485.

It is an arithmetic number, because the mean of its divisors is an integer number (1291500).

Almost surely, 2^18077189 is an apocalyptic number.

18077189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18077189 is a deficient number, since it is larger than the sum of its proper divisors (2586811).

18077189 is a wasteful number, since it uses less digits than its factorization.

18077189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 18077189 is about 4251.7277664498. The cubic root of 18077189 is about 262.4482207772.

The spelling of 18077189 in words is "eighteen million, seventy-seven thousand, one hundred eighty-nine".