72843931 has 2 divisors, whose sum is σ = 72843932. Its totient is φ = 72843930.

The previous prime is 72843913. The next prime is 72843959. The reversal of 72843931 is 13934827.

Together with previous prime (72843913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72843931 - 2²¹ = 70746779 is a prime.

It is a super-2 number, since 2×72843931² = 10612476567065522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72843971) 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, 36421965 + 36421966.

It is an arithmetic number, because the mean of its divisors is an integer number (36421966).

Almost surely, 2^72843931 is an apocalyptic number.

72843931 is a deficient number, since it is larger than the sum of its proper divisors (1).

72843931 is an equidigital number, since it uses as much as digits as its factorization.

72843931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 72843931 is about 8534.8656111271. The cubic root of 72843931 is about 417.6358691017.

The spelling of 72843931 in words is "seventy-two million, eight hundred forty-three thousand, nine hundred thirty-one".