74518909 has 4 divisors (see below), whose sum is σ = 74551516. Its totient is φ = 74486304.

The previous prime is 74518903. The next prime is 74518937. The reversal of 74518909 is 90981547.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39413284 + 35105625 = 6278^2 + 5925^2 .

It is a cyclic number.

It is not a de Polignac number, because 74518909 - 2¹⁵ = 74486141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74518903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12594 + ... + 17539.

It is an arithmetic number, because the mean of its divisors is an integer number (18637879).

Almost surely, 2^74518909 is an apocalyptic number.

It is an amenable number.

74518909 is a deficient number, since it is larger than the sum of its proper divisors (32607).

74518909 is a wasteful number, since it uses less digits than its factorization.

74518909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32606.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 74518909 is about 8632.4335502800. The cubic root of 74518909 is about 420.8126913728.

The spelling of 74518909 in words is "seventy-four million, five hundred eighteen thousand, nine hundred nine".