42287879 has 2 divisors, whose sum is σ = 42287880. Its totient is φ = 42287878.

The previous prime is 42287821. The next prime is 42287881. The reversal of 42287879 is 97878224.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42287879 - 2²⁴ = 25510663 is a prime.

It is a Sophie Germain prime.

Together with 42287881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42287809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21143939 + 21143940.

It is an arithmetic number, because the mean of its divisors is an integer number (21143940).

Almost surely, 2^42287879 is an apocalyptic number.

42287879 is a deficient number, since it is larger than the sum of its proper divisors (1).

42287879 is an equidigital number, since it uses as much as digits as its factorization.

42287879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 42287879 is about 6502.9131164425. The cubic root of 42287879 is about 348.3950434129.

The spelling of 42287879 in words is "forty-two million, two hundred eighty-seven thousand, eight hundred seventy-nine".