422833721 has 4 divisors (see below), whose sum is σ = 424648692. Its totient is φ = 421018752.

The previous prime is 422833693. The next prime is 422833753. The reversal of 422833721 is 127338224.

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 226833721 + 196000000 = 15061^2 + 14000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422833721 is a prime.

It is a super-2 number, since 2×422833721² = 357576711229411682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (422833121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 907136 + ... + 907601.

It is an arithmetic number, because the mean of its divisors is an integer number (106162173).

Almost surely, 2^422833721 is an apocalyptic number.

It is an amenable number.

422833721 is a deficient number, since it is larger than the sum of its proper divisors (1814971).

422833721 is a wasteful number, since it uses less digits than its factorization.

422833721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814970.

The product of its digits is 16128, while the sum is 32.

The square root of 422833721 is about 20562.9210230453. The cubic root of 422833721 is about 750.5677011418.

The spelling of 422833721 in words is "four hundred twenty-two million, eight hundred thirty-three thousand, seven hundred twenty-one".