74240909 has 2 divisors, whose sum is σ = 74240910. Its totient is φ = 74240908.

The previous prime is 74240897. The next prime is 74240911. The reversal of 74240909 is 90904247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58216900 + 16024009 = 7630^2 + 4003^2 .

It is a cyclic number.

It is not a de Polignac number, because 74240909 - 2⁴ = 74240893 is a prime.

Together with 74240911, 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 (74243909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37120454 + 37120455.

It is an arithmetic number, because the mean of its divisors is an integer number (37120455).

Almost surely, 2^74240909 is an apocalyptic number.

It is an amenable number.

74240909 is a deficient number, since it is larger than the sum of its proper divisors (1).

74240909 is an equidigital number, since it uses as much as digits as its factorization.

74240909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 74240909 is about 8616.3164403357. The cubic root of 74240909 is about 420.2887451342.

The spelling of 74240909 in words is "seventy-four million, two hundred forty thousand, nine hundred nine".