19642393 has 4 divisors (see below), whose sum is σ = 19661008. Its totient is φ = 19623780.

The previous prime is 19642387. The next prime is 19642411. The reversal of 19642393 is 39324691.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39324691 = 7 ⋅5617813.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19642393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19642093) 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, 7623 + ... + 9868.

It is an arithmetic number, because the mean of its divisors is an integer number (4915252).

Almost surely, 2^19642393 is an apocalyptic number.

It is an amenable number.

19642393 is a deficient number, since it is larger than the sum of its proper divisors (18615).

19642393 is a wasteful number, since it uses less digits than its factorization.

19642393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18614.

The product of its digits is 34992, while the sum is 37.

The square root of 19642393 is about 4431.9739394541. The cubic root of 19642393 is about 269.8141977284.

The spelling of 19642393 in words is "nineteen million, six hundred forty-two thousand, three hundred ninety-three".