72821923 has 2 divisors, whose sum is σ = 72821924. Its totient is φ = 72821922.

The previous prime is 72821899. The next prime is 72821951. The reversal of 72821923 is 32912827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72821923 - 2¹⁷ = 72690851 is a prime.

It is not a weakly prime, because it can be changed into another prime (72821123) 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, 36410961 + 36410962.

It is an arithmetic number, because the mean of its divisors is an integer number (36410962).

Almost surely, 2^72821923 is an apocalyptic number.

72821923 is a deficient number, since it is larger than the sum of its proper divisors (1).

72821923 is an equidigital number, since it uses as much as digits as its factorization.

72821923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 72821923 is about 8533.5762139914. The cubic root of 72821923 is about 417.5938054007.

The spelling of 72821923 in words is "seventy-two million, eight hundred twenty-one thousand, nine hundred twenty-three".