18966390 has 32 divisors (see below), whose sum is σ = 48198240. Its totient is φ = 4760064.

The previous prime is 18966371. The next prime is 18966391. The reversal of 18966390 is 9366981.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18966391) 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 15 ways as a sum of consecutive naturals, for example, 18085 + ... + 19104.

It is an arithmetic number, because the mean of its divisors is an integer number (1506195).

Almost surely, 2^18966390 is an apocalyptic number.

18966390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18966390 is an abundant number, since it is smaller than the sum of its proper divisors (29231850).

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

18966390 is a wasteful number, since it uses less digits than its factorization.

18966390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37216.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 18966390 is about 4355.0419056537. The cubic root of 18966390 is about 266.6827299352.

The spelling of 18966390 in words is "eighteen million, nine hundred sixty-six thousand, three hundred ninety".