42142987 has 2 divisors, whose sum is σ = 42142988. Its totient is φ = 42142986.

The previous prime is 42142979. The next prime is 42143027. The reversal of 42142987 is 78924124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42142987 - 2³ = 42142979 is a prime.

It is not a weakly prime, because it can be changed into another prime (42142907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21071493 + 21071494.

It is an arithmetic number, because the mean of its divisors is an integer number (21071494).

Almost surely, 2^42142987 is an apocalyptic number.

42142987 is a deficient number, since it is larger than the sum of its proper divisors (1).

42142987 is an equidigital number, since it uses as much as digits as its factorization.

42142987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 42142987 is about 6491.7630116941. The cubic root of 42142987 is about 347.9966832599.

The spelling of 42142987 in words is "forty-two million, one hundred forty-two thousand, nine hundred eighty-seven".