19442663 has 4 divisors (see below), whose sum is σ = 19732920. Its totient is φ = 19152408.

The previous prime is 19442653. The next prime is 19442669. The reversal of 19442663 is 36624491.

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

It is a cyclic number.

It is not a de Polignac number, because 19442663 - 2¹² = 19438567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19442669) 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, 145028 + ... + 145161.

It is an arithmetic number, because the mean of its divisors is an integer number (4933230).

Almost surely, 2^19442663 is an apocalyptic number.

19442663 is a deficient number, since it is larger than the sum of its proper divisors (290257).

19442663 is an equidigital number, since it uses as much as digits as its factorization.

19442663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290256.

The product of its digits is 31104, while the sum is 35.

The square root of 19442663 is about 4409.3835170010. The cubic root of 19442663 is about 268.8965619909.

The spelling of 19442663 in words is "nineteen million, four hundred forty-two thousand, six hundred sixty-three".