42187393 has 2 divisors, whose sum is σ = 42187394. Its totient is φ = 42187392.

The previous prime is 42187381. The next prime is 42187423. The reversal of 42187393 is 39378124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38155329 + 4032064 = 6177^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 42187393 - 2⁵ = 42187361 is a prime.

It is a super-2 number, since 2×42187393² = 3559552256272898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42187303) 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, 21093696 + 21093697.

It is an arithmetic number, because the mean of its divisors is an integer number (21093697).

Almost surely, 2^42187393 is an apocalyptic number.

It is an amenable number.

42187393 is a deficient number, since it is larger than the sum of its proper divisors (1).

42187393 is an equidigital number, since it uses as much as digits as its factorization.

42187393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 42187393 is about 6495.1822915142. The cubic root of 42187393 is about 348.1188682096.

It can be divided in two parts, 4218 and 7393, that added together give a palindrome (11611).

The spelling of 42187393 in words is "forty-two million, one hundred eighty-seven thousand, three hundred ninety-three".