422721765 has 24 divisors (see below), whose sum is σ = 744734328. Its totient is φ = 221754240.

The previous prime is 422721749. The next prime is 422721821. The reversal of 422721765 is 567127224.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12173121 + 410548644 = 3489^2 + 20262^2 .

It is not a de Polignac number, because 422721765 - 2⁴ = 422721749 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74254 + ... + 79743.

It is an arithmetic number, because the mean of its divisors is an integer number (31030597).

Almost surely, 2^422721765 is an apocalyptic number.

422721765 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

422721765 is a deficient number, since it is larger than the sum of its proper divisors (322012563).

422721765 is a wasteful number, since it uses less digits than its factorization.

422721765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154069 (or 154066 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 422721765 is about 20560.1985642163. The cubic root of 422721765 is about 750.5014513207.

Adding to 422721765 its reverse (567127224), we get a palindrome (989848989).

The spelling of 422721765 in words is "four hundred twenty-two million, seven hundred twenty-one thousand, seven hundred sixty-five".