73639243 has 2 divisors, whose sum is σ = 73639244. Its totient is φ = 73639242.

The previous prime is 73639187. The next prime is 73639249. The reversal of 73639243 is 34293637.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 73639243 - 2²¹ = 71542091 is a prime.

It is a super-2 number, since 2×73639243² = 10845476219226098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73639249) 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, 36819621 + 36819622.

It is an arithmetic number, because the mean of its divisors is an integer number (36819622).

Almost surely, 2^73639243 is an apocalyptic number.

73639243 is a deficient number, since it is larger than the sum of its proper divisors (1).

73639243 is an equidigital number, since it uses as much as digits as its factorization.

73639243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 37.

The square root of 73639243 is about 8581.3310739069. The cubic root of 73639243 is about 419.1502907904.

The spelling of 73639243 in words is "seventy-three million, six hundred thirty-nine thousand, two hundred forty-three".