42142979 has 2 divisors, whose sum is σ = 42142980. Its totient is φ = 42142978.

The previous prime is 42142937. The next prime is 42142987. The reversal of 42142979 is 97924124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42142979 - 2¹² = 42138883 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (42142909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21071489 + 21071490.

It is an arithmetic number, because the mean of its divisors is an integer number (21071490).

Almost surely, 2^42142979 is an apocalyptic number.

42142979 is a deficient number, since it is larger than the sum of its proper divisors (1).

42142979 is an equidigital number, since it uses as much as digits as its factorization.

42142979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 42142979 is about 6491.7623955287. The cubic root of 42142979 is about 347.9966612398.

The spelling of 42142979 in words is "forty-two million, one hundred forty-two thousand, nine hundred seventy-nine".