39998423 has 2 divisors, whose sum is σ = 39998424. Its totient is φ = 39998422.

The previous prime is 39998393. The next prime is 39998461. The reversal of 39998423 is 32489993.

It is a weak prime.

It is an emirp because it is prime and its reverse (32489993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39998423 - 2¹⁶ = 39932887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39928423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19999211 + 19999212.

It is an arithmetic number, because the mean of its divisors is an integer number (19999212).

Almost surely, 2^39998423 is an apocalyptic number.

39998423 is a deficient number, since it is larger than the sum of its proper divisors (1).

39998423 is an equidigital number, since it uses as much as digits as its factorization.

39998423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 39998423 is about 6324.4306463112. The cubic root of 39998423 is about 341.9906948895.

The spelling of 39998423 in words is "thirty-nine million, nine hundred ninety-eight thousand, four hundred twenty-three".