42204391 has 2 divisors, whose sum is σ = 42204392. Its totient is φ = 42204390.

The previous prime is 42204389. The next prime is 42204397. The reversal of 42204391 is 19340224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42204391 - 2¹ = 42204389 is a prime.

Together with 42204389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42204397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21102195 + 21102196.

It is an arithmetic number, because the mean of its divisors is an integer number (21102196).

Almost surely, 2^42204391 is an apocalyptic number.

42204391 is a deficient number, since it is larger than the sum of its proper divisors (1).

42204391 is an equidigital number, since it uses as much as digits as its factorization.

42204391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 42204391 is about 6496.4906680453. The cubic root of 42204391 is about 348.1656162193.

The spelling of 42204391 in words is "forty-two million, two hundred four thousand, three hundred ninety-one".