19442217 has 4 divisors (see below), whose sum is σ = 25922960. Its totient is φ = 12961476.

The previous prime is 19442191. The next prime is 19442231. The reversal of 19442217 is 71224491.

19442217 is nontrivially palindromic in base 2.

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 19442217 - 2⁷ = 19442089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19442257) 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, 3240367 + ... + 3240372.

It is an arithmetic number, because the mean of its divisors is an integer number (6480740).

Almost surely, 2^19442217 is an apocalyptic number.

It is an amenable number.

19442217 is a deficient number, since it is larger than the sum of its proper divisors (6480743).

19442217 is an equidigital number, since it uses as much as digits as its factorization.

19442217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6480742.

The product of its digits is 4032, while the sum is 30.

The square root of 19442217 is about 4409.3329427477. The cubic root of 19442217 is about 268.8945058805.

The spelling of 19442217 in words is "nineteen million, four hundred forty-two thousand, two hundred seventeen".