422391 has 4 divisors (see below), whose sum is σ = 563192. Its totient is φ = 281592.

The previous prime is 422377. The next prime is 422393. The reversal of 422391 is 193224.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 422391 - 2¹³ = 414199 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422393) 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 in 3 ways as a sum of consecutive naturals, for example, 70396 + ... + 70401.

It is an arithmetic number, because the mean of its divisors is an integer number (140798).

2⁴²²³⁹¹ is an apocalyptic number.

422391 is a deficient number, since it is larger than the sum of its proper divisors (140801).

422391 is a wasteful number, since it uses less digits than its factorization.

422391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140800.

The product of its digits is 432, while the sum is 21.

The square root of 422391 is about 649.9161484376. The cubic root of 422391 is about 75.0305653196.

The spelling of 422391 in words is "four hundred twenty-two thousand, three hundred ninety-one".