18394490 has 8 divisors (see below), whose sum is σ = 33110100. Its totient is φ = 7357792.

The previous prime is 18394469. The next prime is 18394499. The reversal of 18394490 is 9449381.

It can be written as a sum of positive squares in 2 ways, for example, as 18292729 + 101761 = 4277^2 + 319^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18394499) 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 3 ways as a sum of consecutive naturals, for example, 919715 + ... + 919734.

Almost surely, 2^18394490 is an apocalyptic number.

18394490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18394490 is a deficient number, since it is larger than the sum of its proper divisors (14715610).

18394490 is a wasteful number, since it uses less digits than its factorization.

18394490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839456.

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

The square root of 18394490 is about 4288.8798071291. The cubic root of 18394490 is about 263.9748694322.

The spelling of 18394490 in words is "eighteen million, three hundred ninety-four thousand, four hundred ninety".