42456439 has 2 divisors, whose sum is σ = 42456440. Its totient is φ = 42456438.

The previous prime is 42456433. The next prime is 42456457. The reversal of 42456439 is 93465424.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42456439 - 2⁹ = 42455927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42456398 and 42456407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42456433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21228219 + 21228220.

It is an arithmetic number, because the mean of its divisors is an integer number (21228220).

Almost surely, 2^42456439 is an apocalyptic number.

42456439 is a deficient number, since it is larger than the sum of its proper divisors (1).

42456439 is an equidigital number, since it uses as much as digits as its factorization.

42456439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 37.

The square root of 42456439 is about 6515.8605724800. The cubic root of 42456439 is about 348.8573320200.

The spelling of 42456439 in words is "forty-two million, four hundred fifty-six thousand, four hundred thirty-nine".