423891439 has 2 divisors, whose sum is σ = 423891440. Its totient is φ = 423891438.

The previous prime is 423891421. The next prime is 423891469. The reversal of 423891439 is 934198324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 423891439 - 2⁹ = 423890927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 423891395 and 423891404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423891409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211945719 + 211945720.

It is an arithmetic number, because the mean of its divisors is an integer number (211945720).

Almost surely, 2^423891439 is an apocalyptic number.

423891439 is a deficient number, since it is larger than the sum of its proper divisors (1).

423891439 is an equidigital number, since it uses as much as digits as its factorization.

423891439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 423891439 is about 20588.6240191034. The cubic root of 423891439 is about 751.1930280540.

The spelling of 423891439 in words is "four hundred twenty-three million, eight hundred ninety-one thousand, four hundred thirty-nine".