42388919 has 2 divisors, whose sum is σ = 42388920. Its totient is φ = 42388918.

The previous prime is 42388909. The next prime is 42388921. The reversal of 42388919 is 91988324.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42388919 is a prime.

It is a super-2 number, since 2×42388919² = 3593640907977122, which contains 22 as substring.

Together with 42388921, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42388919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42388909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21194459 + 21194460.

It is an arithmetic number, because the mean of its divisors is an integer number (21194460).

Almost surely, 2^42388919 is an apocalyptic number.

42388919 is a deficient number, since it is larger than the sum of its proper divisors (1).

42388919 is an equidigital number, since it uses as much as digits as its factorization.

42388919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 42388919 is about 6510.6773073160. The cubic root of 42388919 is about 348.6723004491.

The spelling of 42388919 in words is "forty-two million, three hundred eighty-eight thousand, nine hundred nineteen".