19490 has 8 divisors (see below), whose sum is σ = 35100. Its totient is φ = 7792.

The previous prime is 19489. The next prime is 19501. The reversal of 19490 is 9491.

It can be written as a sum of positive squares in 2 ways, for example, as 19321 + 169 = 139^2 + 13^2 .

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 (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965 + ... + 984.

2¹⁹⁴⁹⁰ is an apocalyptic number.

19490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19490 is a deficient number, since it is larger than the sum of its proper divisors (15610).

19490 is a wasteful number, since it uses less digits than its factorization.

19490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 19490 is about 139.6065901023. The cubic root of 19490 is about 26.9114612373.

Subtracting from 19490 its reverse (9491), we obtain a palindrome (9999).

The spelling of 19490 in words is "nineteen thousand, four hundred ninety".