72423889 has 2 divisors, whose sum is σ = 72423890. Its totient is φ = 72423888.

The previous prime is 72423887. The next prime is 72423959. The reversal of 72423889 is 98832427.

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., 72250000 + 173889 = 8500^2 + 417^2 .

It is a cyclic number.

It is not a de Polignac number, because 72423889 - 2¹ = 72423887 is a prime.

Together with 72423887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72423881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36211944 + 36211945.

It is an arithmetic number, because the mean of its divisors is an integer number (36211945).

Almost surely, 2^72423889 is an apocalyptic number.

It is an amenable number.

72423889 is a deficient number, since it is larger than the sum of its proper divisors (1).

72423889 is an equidigital number, since it uses as much as digits as its factorization.

72423889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 72423889 is about 8510.2226175347. Note that the first 3 decimals coincide. The cubic root of 72423889 is about 416.8315793783.

The spelling of 72423889 in words is "seventy-two million, four hundred twenty-three thousand, eight hundred eighty-nine".