74339981 has 2 divisors, whose sum is σ = 74339982. Its totient is φ = 74339980.

The previous prime is 74339977. The next prime is 74339983. The reversal of 74339981 is 18993347.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39175081 + 35164900 = 6259^2 + 5930^2 .

It is a cyclic number.

It is not a de Polignac number, because 74339981 - 2² = 74339977 is a prime.

It is a super-2 number, since 2×74339981² = 11052865550160722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 74339983, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74339983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37169990 + 37169991.

It is an arithmetic number, because the mean of its divisors is an integer number (37169991).

Almost surely, 2^74339981 is an apocalyptic number.

It is an amenable number.

74339981 is a deficient number, since it is larger than the sum of its proper divisors (1).

74339981 is an equidigital number, since it uses as much as digits as its factorization.

74339981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The square root of 74339981 is about 8622.0636160956. The cubic root of 74339981 is about 420.4756157735.

The spelling of 74339981 in words is "seventy-four million, three hundred thirty-nine thousand, nine hundred eighty-one".