72443923 has 4 divisors (see below), whose sum is σ = 72862848. Its totient is φ = 72025000.

The previous prime is 72443909. The next prime is 72443929. The reversal of 72443923 is 32934427.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72443923 - 2²⁵ = 38889491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72443929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209203 + ... + 209548.

It is an arithmetic number, because the mean of its divisors is an integer number (18215712).

Almost surely, 2^72443923 is an apocalyptic number.

72443923 is a deficient number, since it is larger than the sum of its proper divisors (418925).

72443923 is a wasteful number, since it uses less digits than its factorization.

72443923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418924.

The product of its digits is 36288, while the sum is 34.

The square root of 72443923 is about 8511.3995911366. The cubic root of 72443923 is about 416.8700106845.

The spelling of 72443923 in words is "seventy-two million, four hundred forty-three thousand, nine hundred twenty-three".