74787409 has 2 divisors, whose sum is σ = 74787410. Its totient is φ = 74787408.

The previous prime is 74787389. The next prime is 74787457. The reversal of 74787409 is 90478747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51051025 + 23736384 = 7145^2 + 4872^2 .

It is a cyclic number.

It is not a de Polignac number, because 74787409 - 2⁹ = 74786897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74787499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37393704 + 37393705.

It is an arithmetic number, because the mean of its divisors is an integer number (37393705).

Almost surely, 2^74787409 is an apocalyptic number.

It is an amenable number.

74787409 is a deficient number, since it is larger than the sum of its proper divisors (1).

74787409 is an equidigital number, since it uses as much as digits as its factorization.

74787409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 74787409 is about 8647.9713806187. The cubic root of 74787409 is about 421.3174973658.

The spelling of 74787409 in words is "seventy-four million, seven hundred eighty-seven thousand, four hundred nine".