19394023 has 4 divisors (see below), whose sum is σ = 21157128. Its totient is φ = 17630920.

The previous prime is 19393981. The next prime is 19394027. The reversal of 19394023 is 32049391.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19394023 is a prime.

It is a super-2 number, since 2×19394023² = 752256256249058, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19394027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881536 + ... + 881557.

It is an arithmetic number, because the mean of its divisors is an integer number (5289282).

Almost surely, 2^19394023 is an apocalyptic number.

19394023 is a deficient number, since it is larger than the sum of its proper divisors (1763105).

19394023 is a wasteful number, since it uses less digits than its factorization.

19394023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763104.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 19394023 is about 4403.8645528672. The cubic root of 19394023 is about 268.6721405608.

The spelling of 19394023 in words is "nineteen million, three hundred ninety-four thousand, twenty-three".