423749 has 2 divisors, whose sum is σ = 423750. Its totient is φ = 423748.

The previous prime is 423727. The next prime is 423751. The reversal of 423749 is 947324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390625 + 33124 = 625^2 + 182^2 .

It is a cyclic number.

It is not a de Polignac number, because 423749 - 2¹⁶ = 358213 is a prime.

It is a Sophie Germain prime.

Together with 423751, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p₃₅₆₇₈ and since 423749 and 35678 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423769) 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, 211874 + 211875.

It is an arithmetic number, because the mean of its divisors is an integer number (211875).

2⁴²³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

423749 is a deficient number, since it is larger than the sum of its proper divisors (1).

423749 is an equidigital number, since it uses as much as digits as its factorization.

423749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 29.

The square root of 423749 is about 650.9600602188. The cubic root of 423749 is about 75.1108878229.

The spelling of 423749 in words is "four hundred twenty-three thousand, seven hundred forty-nine".