74008391 has 2 divisors, whose sum is σ = 74008392. Its totient is φ = 74008390.

The previous prime is 74008379. The next prime is 74008393. The reversal of 74008391 is 19380047.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74008391 is a prime.

Together with 74008393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74008393) 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, 37004195 + 37004196.

It is an arithmetic number, because the mean of its divisors is an integer number (37004196).

Almost surely, 2^74008391 is an apocalyptic number.

74008391 is a deficient number, since it is larger than the sum of its proper divisors (1).

74008391 is an equidigital number, since it uses as much as digits as its factorization.

74008391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 74008391 is about 8602.8129701860. The cubic root of 74008391 is about 419.8495133582.

The spelling of 74008391 in words is "seventy-four million, eight thousand, three hundred ninety-one".