18989205 has 32 divisors (see below), whose sum is σ = 31761408. Its totient is φ = 9676800.

The previous prime is 18989203. The next prime is 18989213. The reversal of 18989205 is 50298981.

It is a happy number.

It is not a de Polignac number, because 18989205 - 2¹ = 18989203 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18989203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44895 + ... + 45315.

It is an arithmetic number, because the mean of its divisors is an integer number (992544).

Almost surely, 2^18989205 is an apocalyptic number.

18989205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18989205 is a deficient number, since it is larger than the sum of its proper divisors (12772203).

18989205 is a wasteful number, since it uses less digits than its factorization.

18989205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 18989205 is about 4357.6604961837. The cubic root of 18989205 is about 266.7896195163.

The spelling of 18989205 in words is "eighteen million, nine hundred eighty-nine thousand, two hundred five".