19973423 has 2 divisors, whose sum is σ = 19973424. Its totient is φ = 19973422.

The previous prime is 19973399. The next prime is 19973461. The reversal of 19973423 is 32437991.

It is an a-pointer prime, because the next prime (19973461) can be obtained adding 19973423 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19973423 - 2¹⁴ = 19957039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19973483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9986711 + 9986712.

It is an arithmetic number, because the mean of its divisors is an integer number (9986712).

Almost surely, 2^19973423 is an apocalyptic number.

19973423 is a deficient number, since it is larger than the sum of its proper divisors (1).

19973423 is an equidigital number, since it uses as much as digits as its factorization.

19973423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The square root of 19973423 is about 4469.1635682754. The cubic root of 19973423 is about 271.3214732337.

The spelling of 19973423 in words is "nineteen million, nine hundred seventy-three thousand, four hundred twenty-three".