19974923 has 2 divisors, whose sum is σ = 19974924. Its totient is φ = 19974922.

The previous prime is 19974907. The next prime is 19974967. The reversal of 19974923 is 32947991.

It is an a-pointer prime, because the next prime (19974967) can be obtained adding 19974923 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19974923 - 2⁴ = 19974907 is a prime.

It is not a weakly prime, because it can be changed into another prime (19974223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9987461 + 9987462.

It is an arithmetic number, because the mean of its divisors is an integer number (9987462).

Almost surely, 2^19974923 is an apocalyptic number.

19974923 is a deficient number, since it is larger than the sum of its proper divisors (1).

19974923 is an equidigital number, since it uses as much as digits as its factorization.

19974923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 19974923 is about 4469.3313817617. The cubic root of 19974923 is about 271.3282651261.

The spelling of 19974923 in words is "nineteen million, nine hundred seventy-four thousand, nine hundred twenty-three".