19242689 has 4 divisors (see below), whose sum is σ = 19906260. Its totient is φ = 18579120.

The previous prime is 19242667. The next prime is 19242709. The reversal of 19242689 is 98624291.

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 6225025 + 13017664 = 2495^2 + 3608^2 .

It is a cyclic number.

It is not a de Polignac number, because 19242689 - 2²⁴ = 2465473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19242889) 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, 331742 + ... + 331799.

It is an arithmetic number, because the mean of its divisors is an integer number (4976565).

Almost surely, 2^19242689 is an apocalyptic number.

It is an amenable number.

19242689 is a deficient number, since it is larger than the sum of its proper divisors (663571).

19242689 is an equidigital number, since it uses as much as digits as its factorization.

19242689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663570.

The product of its digits is 62208, while the sum is 41.

The square root of 19242689 is about 4386.6489487991. The cubic root of 19242689 is about 267.9714874619.

The spelling of 19242689 in words is "nineteen million, two hundred forty-two thousand, six hundred eighty-nine".