726622921 has 2 divisors, whose sum is σ = 726622922. Its totient is φ = 726622920.

The previous prime is 726622913. The next prime is 726622931. The reversal of 726622921 is 129226627.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686440000 + 40182921 = 26200^2 + 6339^2 .

It is a cyclic number.

It is not a de Polignac number, because 726622921 - 2³ = 726622913 is a prime.

It is not a weakly prime, because it can be changed into another prime (726622931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363311460 + 363311461.

It is an arithmetic number, because the mean of its divisors is an integer number (363311461).

Almost surely, 2^726622921 is an apocalyptic number.

It is an amenable number.

726622921 is a deficient number, since it is larger than the sum of its proper divisors (1).

726622921 is an equidigital number, since it uses as much as digits as its factorization.

726622921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 726622921 is about 26955.9440754725. The cubic root of 726622921 is about 899.0207130169.

The spelling of 726622921 in words is "seven hundred twenty-six million, six hundred twenty-two thousand, nine hundred twenty-one".