42279439 has 2 divisors, whose sum is σ = 42279440. Its totient is φ = 42279438.

The previous prime is 42279409. The next prime is 42279467. The reversal of 42279439 is 93497224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42279439 - 2⁵ = 42279407 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42279409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21139719 + 21139720.

It is an arithmetic number, because the mean of its divisors is an integer number (21139720).

Almost surely, 2^42279439 is an apocalyptic number.

42279439 is a deficient number, since it is larger than the sum of its proper divisors (1).

42279439 is an equidigital number, since it uses as much as digits as its factorization.

42279439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 42279439 is about 6502.2641441270. The cubic root of 42279439 is about 348.3718638015.

The spelling of 42279439 in words is "forty-two million, two hundred seventy-nine thousand, four hundred thirty-nine".