19690 has 16 divisors (see below), whose sum is σ = 38880. Its totient is φ = 7120.

The previous prime is 19687. The next prime is 19697. The reversal of 19690 is 9691.

19690 = T₃₄ + T₃₅ + ... + T₅₃.

19690 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×19690² = 775392200, which contains 22 as substring.

19690 is strictly pandigital in base 6.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (19697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21 + ... + 199.

It is an arithmetic number, because the mean of its divisors is an integer number (2430).

2¹⁹⁶⁹⁰ is an apocalyptic number.

19690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19690 is a deficient number, since it is larger than the sum of its proper divisors (19190).

19690 is a wasteful number, since it uses less digits than its factorization.

19690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 19690 is about 140.3210604293. The cubic root of 19690 is about 27.0032003522.

Subtracting from 19690 its reverse (9691), we obtain a palindrome (9999).

The spelling of 19690 in words is "nineteen thousand, six hundred ninety".