19850 has 12 divisors (see below), whose sum is σ = 37014. Its totient is φ = 7920.

The previous prime is 19843. The next prime is 19853. The reversal of 19850 is 5891.

It can be written as a sum of positive squares in 3 ways, for example, as 16129 + 3721 = 127^2 + 61^2 .

It is not an unprimeable number, because it can be changed into a prime (19853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 149 + ... + 248.

2¹⁹⁸⁵⁰ is an apocalyptic number.

19850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19850 is a deficient number, since it is larger than the sum of its proper divisors (17164).

19850 is a wasteful number, since it uses less digits than its factorization.

19850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 19850 is about 140.8900280361. The cubic root of 19850 is about 27.0761453640.

The spelling of 19850 in words is "nineteen thousand, eight hundred fifty".