18494390 has 8 divisors (see below), whose sum is σ = 33289920. Its totient is φ = 7397752.

The previous prime is 18494389. The next prime is 18494401. The reversal of 18494390 is 9349481.

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

It is a super-2 number, since 2×18494390² = 684084922944200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 924710 + ... + 924729.

It is an arithmetic number, because the mean of its divisors is an integer number (4161240).

Almost surely, 2^18494390 is an apocalyptic number.

18494390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18494390 is a deficient number, since it is larger than the sum of its proper divisors (14795530).

18494390 is a wasteful number, since it uses less digits than its factorization.

18494390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849446.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18494390 is about 4300.5104348205. The cubic root of 18494390 is about 264.4518871468.

The spelling of 18494390 in words is "eighteen million, four hundred ninety-four thousand, three hundred ninety".