422645 has 8 divisors (see below), whose sum is σ = 511704. Its totient is φ = 335104.

The previous prime is 422627. The next prime is 422657. The reversal of 422645 is 546224.

It can be written as a sum of positive squares in 4 ways, for example, as 1444 + 421201 = 38^2 + 649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 422645 - 2⁶ = 422581 is a prime.

It is a d-powerful number, because it can be written as 4³ + 2¹³ + 6⁷ + 2¹⁷ + 4⁴ + 5⁵ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 422645.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 422645.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377 + ... + 993.

It is an arithmetic number, because the mean of its divisors is an integer number (63963).

2⁴²²⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

422645 is a deficient number, since it is larger than the sum of its proper divisors (89059).

422645 is a wasteful number, since it uses less digits than its factorization.

422645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759.

The product of its digits is 1920, while the sum is 23.

The square root of 422645 is about 650.1115288933. Note that the first 3 decimals coincide. The cubic root of 422645 is about 75.0456018969.

Adding to 422645 its reverse (546224), we get a palindrome (968869).

The spelling of 422645 in words is "four hundred twenty-two thousand, six hundred forty-five".