42040387 has 2 divisors, whose sum is σ = 42040388. Its totient is φ = 42040386.

The previous prime is 42040373. The next prime is 42040409. The reversal of 42040387 is 78304024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42040387 - 2⁷ = 42040259 is a prime.

It is not a weakly prime, because it can be changed into another prime (42046387) 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, 21020193 + 21020194.

It is an arithmetic number, because the mean of its divisors is an integer number (21020194).

Almost surely, 2^42040387 is an apocalyptic number.

42040387 is a deficient number, since it is larger than the sum of its proper divisors (1).

42040387 is an equidigital number, since it uses as much as digits as its factorization.

42040387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 42040387 is about 6483.8558744007. The cubic root of 42040387 is about 347.7140464838.

The spelling of 42040387 in words is "forty-two million, forty thousand, three hundred eighty-seven".