19797 has 4 divisors (see below), whose sum is σ = 26400. Its totient is φ = 13196.
The previous prime is 19793. The next prime is 19801. The reversal of 19797 is 79791.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79791 = 3 ⋅26597.
It is an interprime number because it is at equal distance from previous prime (19793) and next prime (19801).
It is a cyclic number.
It is not a de Polignac number, because 19797 - 22 = 19793 is a prime.
It is a D-number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19793) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3297 + ... + 3302.
It is an arithmetic number, because the mean of its divisors is an integer number (6600).
219797 is an apocalyptic number.
It is an amenable number.
19797 is a deficient number, since it is larger than the sum of its proper divisors (6603).
19797 is an equidigital number, since it uses as much as digits as its factorization.
19797 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6602.
The product of its digits is 3969, while the sum is 33.
The square root of 19797 is about 140.7018123551. The cubic root of 19797 is about 27.0520258880.
The spelling of 19797 in words is "nineteen thousand, seven hundred ninety-seven".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.018 sec. • engine limits •