74438909 has 2 divisors, whose sum is σ = 74438910. Its totient is φ = 74438908.

The previous prime is 74438899. The next prime is 74438927. The reversal of 74438909 is 90983447.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73444900 + 994009 = 8570^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 74438909 - 2¹⁶ = 74373373 is a prime.

It is a super-2 number, since 2×74438909² = 11082302346220562, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74438909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74438939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37219454 + 37219455.

It is an arithmetic number, because the mean of its divisors is an integer number (37219455).

Almost surely, 2^74438909 is an apocalyptic number.

It is an amenable number.

74438909 is a deficient number, since it is larger than the sum of its proper divisors (1).

74438909 is an equidigital number, since it uses as much as digits as its factorization.

74438909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 74438909 is about 8627.7986184194. The cubic root of 74438909 is about 420.6620492069.

The spelling of 74438909 in words is "seventy-four million, four hundred thirty-eight thousand, nine hundred nine".