74115989 has 2 divisors, whose sum is σ = 74115990. Its totient is φ = 74115988.

The previous prime is 74115917. The next prime is 74115997. The reversal of 74115989 is 98951147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73393489 + 722500 = 8567^2 + 850^2 .

It is an emirp because it is prime and its reverse (98951147) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74115989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74115289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37057994 + 37057995.

It is an arithmetic number, because the mean of its divisors is an integer number (37057995).

Almost surely, 2^74115989 is an apocalyptic number.

It is an amenable number.

74115989 is a deficient number, since it is larger than the sum of its proper divisors (1).

74115989 is an equidigital number, since it uses as much as digits as its factorization.

74115989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 44.

The square root of 74115989 is about 8609.0643510198. The cubic root of 74115989 is about 420.0528826080.

The spelling of 74115989 in words is "seventy-four million, one hundred fifteen thousand, nine hundred eighty-nine".