42087919 has 2 divisors, whose sum is σ = 42087920. Its totient is φ = 42087918.

The previous prime is 42087911. The next prime is 42088003. The reversal of 42087919 is 91978024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42087919 - 2³ = 42087911 is a prime.

It is a super-2 number, since 2×42087919² = 3542785851501122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42087911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21043959 + 21043960.

It is an arithmetic number, because the mean of its divisors is an integer number (21043960).

Almost surely, 2^42087919 is an apocalyptic number.

42087919 is a deficient number, since it is larger than the sum of its proper divisors (1).

42087919 is an equidigital number, since it uses as much as digits as its factorization.

42087919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 42087919 is about 6487.5202504501. The cubic root of 42087919 is about 347.8450420995.

The spelling of 42087919 in words is "forty-two million, eighty-seven thousand, nine hundred nineteen".