19942 has 12 divisors (see below), whose sum is σ = 32940. Its totient is φ = 9048.

The previous prime is 19937. The next prime is 19949. The reversal of 19942 is 24991.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19949) by changing a digit.

19942 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 309 + ... + 367.

It is an arithmetic number, because the mean of its divisors is an integer number (2745).

2¹⁹⁹⁴² is an apocalyptic number.

19942 is a deficient number, since it is larger than the sum of its proper divisors (12998).

19942 is a wasteful number, since it uses less digits than its factorization.

19942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 74 counting only the distinct ones).

The product of its digits is 648, while the sum is 25.

The square root of 19942 is about 141.2161463856. The cubic root of 19942 is about 27.1179113900.

It can be divided in two parts, 19 and 942, that added together give a square (961 = 31²).

The spelling of 19942 in words is "nineteen thousand, nine hundred forty-two".