19822989 has 4 divisors (see below), whose sum is σ = 26430656. Its totient is φ = 13215324.

The previous prime is 19822963. The next prime is 19822991. The reversal of 19822989 is 98922891.

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.

It is not a de Polignac number, because 19822989 - 2²¹ = 17725837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19822949) 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, 3303829 + ... + 3303834.

It is an arithmetic number, because the mean of its divisors is an integer number (6607664).

Almost surely, 2^19822989 is an apocalyptic number.

It is an amenable number.

19822989 is a deficient number, since it is larger than the sum of its proper divisors (6607667).

19822989 is an equidigital number, since it uses as much as digits as its factorization.

19822989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6607666.

The product of its digits is 186624, while the sum is 48.

The square root of 19822989 is about 4452.3015396534. The cubic root of 19822989 is about 270.6385844973.

The spelling of 19822989 in words is "nineteen million, eight hundred twenty-two thousand, nine hundred eighty-nine".