423726781 has 2 divisors, whose sum is σ = 423726782. Its totient is φ = 423726780.

The previous prime is 423726763. The next prime is 423726791. The reversal of 423726781 is 187627324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340734681 + 82992100 = 18459^2 + 9110^2 .

It is a cyclic number.

It is not a de Polignac number, because 423726781 - 2⁹ = 423726269 is a prime.

It is a super-2 number, since 2×423726781² = 359088769873243922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423726791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211863390 + 211863391.

It is an arithmetic number, because the mean of its divisors is an integer number (211863391).

Almost surely, 2^423726781 is an apocalyptic number.

It is an amenable number.

423726781 is a deficient number, since it is larger than the sum of its proper divisors (1).

423726781 is an equidigital number, since it uses as much as digits as its factorization.

423726781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 40.

The square root of 423726781 is about 20584.6248690619. The cubic root of 423726781 is about 751.0957500332.

The spelling of 423726781 in words is "four hundred twenty-three million, seven hundred twenty-six thousand, seven hundred eighty-one".