721900423 has 2 divisors, whose sum is σ = 721900424. Its totient is φ = 721900422.

The previous prime is 721900409. The next prime is 721900447. The reversal of 721900423 is 324009127.

721900423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721900423 - 2¹³ = 721892231 is a prime.

It is a super-2 number, since 2×721900423² = 1042280441455157858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 721900391 and 721900400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721900453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360950211 + 360950212.

It is an arithmetic number, because the mean of its divisors is an integer number (360950212).

Almost surely, 2^721900423 is an apocalyptic number.

721900423 is a deficient number, since it is larger than the sum of its proper divisors (1).

721900423 is an equidigital number, since it uses as much as digits as its factorization.

721900423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 721900423 is about 26868.2046850920. The cubic root of 721900423 is about 897.0688273235.

The spelling of 721900423 in words is "seven hundred twenty-one million, nine hundred thousand, four hundred twenty-three".