19922489 has 4 divisors (see below), whose sum is σ = 20032740. Its totient is φ = 19812240.

The previous prime is 19922479. The next prime is 19922509. The reversal of 19922489 is 98422991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4579600 + 15342889 = 2140^2 + 3917^2 .

It is a cyclic number.

It is not a de Polignac number, because 19922489 - 2⁴ = 19922473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19922479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54854 + ... + 55215.

It is an arithmetic number, because the mean of its divisors is an integer number (5008185).

Almost surely, 2^19922489 is an apocalyptic number.

It is an amenable number.

19922489 is a deficient number, since it is larger than the sum of its proper divisors (110251).

19922489 is a wasteful number, since it uses less digits than its factorization.

19922489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110250.

The product of its digits is 93312, while the sum is 44.

The square root of 19922489 is about 4463.4615490670. The cubic root of 19922489 is about 271.0906456391.

The spelling of 19922489 in words is "nineteen million, nine hundred twenty-two thousand, four hundred eighty-nine".