18434890 has 8 divisors (see below), whose sum is σ = 33182820. Its totient is φ = 7373952.

The previous prime is 18434879. The next prime is 18434957. The reversal of 18434890 is 9843481.

It can be written as a sum of positive squares in 2 ways, for example, as 18429849 + 5041 = 4293^2 + 71^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 921735 + ... + 921754.

Almost surely, 2^18434890 is an apocalyptic number.

18434890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18434890 is a deficient number, since it is larger than the sum of its proper divisors (14747930).

18434890 is a wasteful number, since it uses less digits than its factorization.

18434890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843496.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18434890 is about 4293.5870784229. The cubic root of 18434890 is about 264.1679849912.

The spelling of 18434890 in words is "eighteen million, four hundred thirty-four thousand, eight hundred ninety".