74085989 has 2 divisors, whose sum is σ = 74085990. Its totient is φ = 74085988.

The previous prime is 74085971. The next prime is 74086009. The reversal of 74085989 is 98958047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44328964 + 29757025 = 6658^2 + 5455^2 .

It is a cyclic number.

It is not a de Polignac number, because 74085989 - 2²⁰ = 73037413 is a prime.

It is a super-2 number, since 2×74085989² = 10977467532216242, which contains 22 as substring.

It is a Sophie Germain 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 (74085919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37042994 + 37042995.

It is an arithmetic number, because the mean of its divisors is an integer number (37042995).

Almost surely, 2^74085989 is an apocalyptic number.

It is an amenable number.

74085989 is a deficient number, since it is larger than the sum of its proper divisors (1).

74085989 is an equidigital number, since it uses as much as digits as its factorization.

74085989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 74085989 is about 8607.3218250510. The cubic root of 74085989 is about 419.9961998900.

The spelling of 74085989 in words is "seventy-four million, eighty-five thousand, nine hundred eighty-nine".