19940393 has 4 divisors (see below), whose sum is σ = 21753168. Its totient is φ = 18127620.

The previous prime is 19940383. The next prime is 19940411. The reversal of 19940393 is 39304991.

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: 39304991 = 11 ⋅3573181.

It is a cyclic number.

It is not a de Polignac number, because 19940393 - 2⁴ = 19940377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19940363) 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, 906371 + ... + 906392.

It is an arithmetic number, because the mean of its divisors is an integer number (5438292).

Almost surely, 2^19940393 is an apocalyptic number.

It is an amenable number.

19940393 is a deficient number, since it is larger than the sum of its proper divisors (1812775).

19940393 is a wasteful number, since it uses less digits than its factorization.

19940393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812774.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 19940393 is about 4465.4667169289. The cubic root of 19940393 is about 271.1718294994.

The spelling of 19940393 in words is "nineteen million, nine hundred forty thousand, three hundred ninety-three".