19949 has 2 divisors, whose sum is σ = 19950.
Its totient is φ = 19948.
The previous prime is 19937. The next prime is 19961. The reversal of 19949 is 94991.
It is a balanced prime because it is at equal distance from previous prime (19937) and next prime (19961).
It can be written as a sum of positive squares in only one way, i.e., 13225 + 6724 = 115^2 + 82^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-19949 is a prime.
It is a Chen prime.
It is a nialpdrome in base 12.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (19919) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9974 + 9975.
It is an arithmetic number, because the mean of its divisors is an integer number (9975).
219949 is an apocalyptic number.
It is an amenable number.
19949 is a deficient number, since it is larger than the sum of its proper divisors (1).
19949 is an equidigital number, since it uses as much as digits as its factorization.
19949 is an evil number, because the sum of its binary digits is even.
The product of its digits is 2916, while the sum is 32.
The square root of 19949 is about 141.2409289123.
The cubic root of 19949 is about 27.1210839767.
The spelling of 19949 in words is "nineteen thousand, nine hundred forty-nine".