72543923 has 2 divisors, whose sum is σ = 72543924. Its totient is φ = 72543922.

The previous prime is 72543869. The next prime is 72543941. The reversal of 72543923 is 32934527.

It is a strong prime.

It is an emirp because it is prime and its reverse (32934527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72543923 - 2¹⁸ = 72281779 is a prime.

It is not a weakly prime, because it can be changed into another prime (72543943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36271961 + 36271962.

It is an arithmetic number, because the mean of its divisors is an integer number (36271962).

Almost surely, 2^72543923 is an apocalyptic number.

72543923 is a deficient number, since it is larger than the sum of its proper divisors (1).

72543923 is an equidigital number, since it uses as much as digits as its factorization.

72543923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 35.

The square root of 72543923 is about 8517.2720398024. The cubic root of 72543923 is about 417.0617352294.

The spelling of 72543923 in words is "seventy-two million, five hundred forty-three thousand, nine hundred twenty-three".