74709209 has 4 divisors (see below), whose sum is σ = 74863104. Its totient is φ = 74555316.

The previous prime is 74709161. The next prime is 74709211. The reversal of 74709209 is 90290747.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90290747 = 53 ⋅1703599.

It is a cyclic number.

It is not a de Polignac number, because 74709209 - 2²⁰ = 73660633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74709269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76217 + ... + 77190.

It is an arithmetic number, because the mean of its divisors is an integer number (18715776).

Almost surely, 2^74709209 is an apocalyptic number.

It is an amenable number.

74709209 is a deficient number, since it is larger than the sum of its proper divisors (153895).

74709209 is a wasteful number, since it uses less digits than its factorization.

74709209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153894.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 74709209 is about 8643.4489065419. The cubic root of 74709209 is about 421.1705986704.

The spelling of 74709209 in words is "seventy-four million, seven hundred nine thousand, two hundred nine".