42046391 has 2 divisors, whose sum is σ = 42046392. Its totient is φ = 42046390.

The previous prime is 42046387. The next prime is 42046397. The reversal of 42046391 is 19364024.

42046391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42046391 - 2² = 42046387 is a prime.

It is a super-2 number, since 2×42046391² = 3535797992249762, 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 (42046397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21023195 + 21023196.

It is an arithmetic number, because the mean of its divisors is an integer number (21023196).

Almost surely, 2^42046391 is an apocalyptic number.

42046391 is a deficient number, since it is larger than the sum of its proper divisors (1).

42046391 is an equidigital number, since it uses as much as digits as its factorization.

42046391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 42046391 is about 6484.3188539738. The cubic root of 42046391 is about 347.7305986289.

The spelling of 42046391 in words is "forty-two million, forty-six thousand, three hundred ninety-one".