17994490 has 16 divisors (see below), whose sum is σ = 33180840. Its totient is φ = 7022080.

The previous prime is 17994481. The next prime is 17994491. The reversal of 17994490 is 9449971.

It can be written as a sum of positive squares in 4 ways, for example, as 14265729 + 3728761 = 3777^2 + 1931^2 .

It is not an unprimeable number, because it can be changed into a prime (17994491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21535 + ... + 22354.

Almost surely, 2^17994490 is an apocalyptic number.

17994490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

17994490 is a deficient number, since it is larger than the sum of its proper divisors (15186350).

17994490 is a wasteful number, since it uses less digits than its factorization.

17994490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43937.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 17994490 is about 4241.9912776902. The cubic root of 17994490 is about 262.0473954232.

The spelling of 17994490 in words is "seventeen million, nine hundred ninety-four thousand, four hundred ninety".