73840381 has 2 divisors, whose sum is σ = 73840382. Its totient is φ = 73840380.

The previous prime is 73840339. The next prime is 73840387. The reversal of 73840381 is 18304837.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73102500 + 737881 = 8550^2 + 859^2 .

It is an emirp because it is prime and its reverse (18304837) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73840381 - 2⁷ = 73840253 is a prime.

It is a super-4 number, since 4×73840381⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73840387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36920190 + 36920191.

It is an arithmetic number, because the mean of its divisors is an integer number (36920191).

Almost surely, 2^73840381 is an apocalyptic number.

It is an amenable number.

73840381 is a deficient number, since it is larger than the sum of its proper divisors (1).

73840381 is an equidigital number, since it uses as much as digits as its factorization.

73840381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 73840381 is about 8593.0425927025. The cubic root of 73840381 is about 419.5315657979.

The spelling of 73840381 in words is "seventy-three million, eight hundred forty thousand, three hundred eighty-one".