19394143 has 2 divisors, whose sum is σ = 19394144. Its totient is φ = 19394142.

The previous prime is 19394119. The next prime is 19394149. The reversal of 19394143 is 34149391.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19394143 is a prime.

It is a super-2 number, since 2×19394143² = 752265565408898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19394099 and 19394108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19394149) 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 as a sum of consecutive naturals, namely, 9697071 + 9697072.

It is an arithmetic number, because the mean of its divisors is an integer number (9697072).

Almost surely, 2^19394143 is an apocalyptic number.

19394143 is a deficient number, since it is larger than the sum of its proper divisors (1).

19394143 is an equidigital number, since it uses as much as digits as its factorization.

19394143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 19394143 is about 4403.8781772433. The cubic root of 19394143 is about 268.6726946935.

The spelling of 19394143 in words is "nineteen million, three hundred ninety-four thousand, one hundred forty-three".