42619987 has 2 divisors, whose sum is σ = 42619988. Its totient is φ = 42619986.

The previous prime is 42619921. The next prime is 42619999. The reversal of 42619987 is 78991624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42619987 - 2⁷ = 42619859 is a prime.

It is not a weakly prime, because it can be changed into another prime (42619387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21309993 + 21309994.

It is an arithmetic number, because the mean of its divisors is an integer number (21309994).

Almost surely, 2^42619987 is an apocalyptic number.

42619987 is a deficient number, since it is larger than the sum of its proper divisors (1).

42619987 is an equidigital number, since it uses as much as digits as its factorization.

42619987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 42619987 is about 6528.3985019299. The cubic root of 42619987 is about 349.3047067532.

The spelling of 42619987 in words is "forty-two million, six hundred nineteen thousand, nine hundred eighty-seven".