422655781 has 4 divisors (see below), whose sum is σ = 425099052. Its totient is φ = 420212512.

The previous prime is 422655769. The next prime is 422655787. The reversal of 422655781 is 187556224.

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

It can be written as a sum of positive squares in 2 ways, for example, as 347486881 + 75168900 = 18641^2 + 8670^2 .

It is a cyclic number.

It is not a de Polignac number, because 422655781 - 2⁹ = 422655269 is a prime.

It is a super-2 number, since 2×422655781² = 357275818425439922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (422655787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1221376 + ... + 1221721.

It is an arithmetic number, because the mean of its divisors is an integer number (106274763).

Almost surely, 2^422655781 is an apocalyptic number.

It is an amenable number.

422655781 is a deficient number, since it is larger than the sum of its proper divisors (2443271).

422655781 is a wasteful number, since it uses less digits than its factorization.

422655781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443270.

The product of its digits is 134400, while the sum is 40.

The square root of 422655781 is about 20558.5938478292. The cubic root of 422655781 is about 750.4623998936.

The spelling of 422655781 in words is "four hundred twenty-two million, six hundred fifty-five thousand, seven hundred eighty-one".