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19946 = 29973
BaseRepresentation
bin100110111101010
31000100202
410313222
51114241
6232202
7112103
oct46752
930322
1019946
1113a93
12b662
139104
1473aa
155d9b
hex4dea

19946 has 4 divisors (see below), whose sum is σ = 29922. Its totient is φ = 9972.

The previous prime is 19937. The next prime is 19949. The reversal of 19946 is 64991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64991 = 173823.

It can be written as a sum of positive squares in only one way, i.e., 19321 + 625 = 139^2 + 25^2 .

It is a nialpdrome in base 12.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4985 + ... + 4988.

219946 is an apocalyptic number.

19946 is a deficient number, since it is larger than the sum of its proper divisors (9976).

19946 is an equidigital number, since it uses as much as digits as its factorization.

19946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9975.

The product of its digits is 1944, while the sum is 29.

The square root of 19946 is about 141.2303083619. The cubic root of 19946 is about 27.1197243876.

The spelling of 19946 in words is "nineteen thousand, nine hundred forty-six".

Divisors: 1 2 9973 19946