19442393 has 4 divisors (see below), whose sum is σ = 19453860. Its totient is φ = 19430928.

The previous prime is 19442387. The next prime is 19442413. The reversal of 19442393 is 39324491.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39324491 = 1399 ⋅28109.

It can be written as a sum of positive squares in 2 ways, for example, as 1098304 + 18344089 = 1048^2 + 4283^2 .

It is a cyclic number.

It is not a de Polignac number, because 19442393 - 2¹⁶ = 19376857 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 (19442993) 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, 2630 + ... + 6767.

It is an arithmetic number, because the mean of its divisors is an integer number (4863465).

Almost surely, 2^19442393 is an apocalyptic number.

It is an amenable number.

19442393 is a deficient number, since it is larger than the sum of its proper divisors (11467).

19442393 is an equidigital number, since it uses as much as digits as its factorization.

19442393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11466.

The product of its digits is 23328, while the sum is 35.

The square root of 19442393 is about 4409.3529003698. The cubic root of 19442393 is about 268.8953172642.

The spelling of 19442393 in words is "nineteen million, four hundred forty-two thousand, three hundred ninety-three".