19826009 has 4 divisors (see below), whose sum is σ = 22658304. Its totient is φ = 16993716.

The previous prime is 19825979. The next prime is 19826033. The reversal of 19826009 is 90062891.

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: 90062891 = 103 ⋅874397.

It is a cyclic number.

It is not a de Polignac number, because 19826009 - 2¹² = 19821913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19826009.

It is not an unprimeable number, because it can be changed into a prime (19826099) 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, 1416137 + ... + 1416150.

It is an arithmetic number, because the mean of its divisors is an integer number (5664576).

Almost surely, 2^19826009 is an apocalyptic number.

It is an amenable number.

19826009 is a deficient number, since it is larger than the sum of its proper divisors (2832295).

19826009 is an equidigital number, since it uses as much as digits as its factorization.

19826009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832294.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 19826009 is about 4452.6406771712. The cubic root of 19826009 is about 270.6523275815.

The spelling of 19826009 in words is "nineteen million, eight hundred twenty-six thousand, nine".