42495979 has 2 divisors, whose sum is σ = 42495980. Its totient is φ = 42495978.

The previous prime is 42495977. The next prime is 42496021. The reversal of 42495979 is 97959424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42495979 - 2¹ = 42495977 is a prime.

Together with 42495977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42495977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21247989 + 21247990.

It is an arithmetic number, because the mean of its divisors is an integer number (21247990).

Almost surely, 2^42495979 is an apocalyptic number.

42495979 is a deficient number, since it is larger than the sum of its proper divisors (1).

42495979 is an equidigital number, since it uses as much as digits as its factorization.

42495979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 42495979 is about 6518.8940012858. The cubic root of 42495979 is about 348.9655962343.

The spelling of 42495979 in words is "forty-two million, four hundred ninety-five thousand, nine hundred seventy-nine".