19942423 has 2 divisors, whose sum is σ = 19942424. Its totient is φ = 19942422.

The previous prime is 19942397. The next prime is 19942451. The reversal of 19942423 is 32424991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19942423 - 2²¹ = 17845271 is a prime.

It is a super-2 number, since 2×19942423² = 795400470221858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19942463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9971211 + 9971212.

It is an arithmetic number, because the mean of its divisors is an integer number (9971212).

Almost surely, 2^19942423 is an apocalyptic number.

19942423 is a deficient number, since it is larger than the sum of its proper divisors (1).

19942423 is an equidigital number, since it uses as much as digits as its factorization.

19942423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 19942423 is about 4465.6940110133. The cubic root of 19942423 is about 271.1810312594.

The spelling of 19942423 in words is "nineteen million, nine hundred forty-two thousand, four hundred twenty-three".