722426209 has 4 divisors (see below), whose sum is σ = 722842900. Its totient is φ = 722009520.

The previous prime is 722426153. The next prime is 722426239. The reversal of 722426209 is 902624227.

722426209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 151216209 + 571210000 = 12297^2 + 23900^2 .

It is a cyclic number.

It is not a de Polignac number, because 722426209 - 2²⁹ = 185555297 is a prime.

It is a super-2 number, since 2×722426209² = 1043799254900223362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722426239) 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, 205734 + ... + 209215.

It is an arithmetic number, because the mean of its divisors is an integer number (180710725).

Almost surely, 2^722426209 is an apocalyptic number.

It is an amenable number.

722426209 is a deficient number, since it is larger than the sum of its proper divisors (416691).

722426209 is a wasteful number, since it uses less digits than its factorization.

722426209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416690.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 722426209 is about 26877.9874432592. The cubic root of 722426209 is about 897.2865636166.

It can be divided in two parts, 7224 and 26209, that added together give a palindrome (33433).

The spelling of 722426209 in words is "seven hundred twenty-two million, four hundred twenty-six thousand, two hundred nine".