423672391 has 2 divisors, whose sum is σ = 423672392. Its totient is φ = 423672390.

The previous prime is 423672383. The next prime is 423672401. The reversal of 423672391 is 193276324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 423672391 - 2³ = 423672383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 423672391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423672341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211836195 + 211836196.

It is an arithmetic number, because the mean of its divisors is an integer number (211836196).

Almost surely, 2^423672391 is an apocalyptic number.

423672391 is a deficient number, since it is larger than the sum of its proper divisors (1).

423672391 is an equidigital number, since it uses as much as digits as its factorization.

423672391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 37.

The square root of 423672391 is about 20583.3036949854. The cubic root of 423672391 is about 751.0636115203.

The spelling of 423672391 in words is "four hundred twenty-three million, six hundred seventy-two thousand, three hundred ninety-one".