74591409 has 4 divisors (see below), whose sum is σ = 99455216. Its totient is φ = 49727604.

The previous prime is 74591389. The next prime is 74591411. The reversal of 74591409 is 90419547.

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: 90419547 = 3 ⋅30139849.

It is not a de Polignac number, because 74591409 - 2⁹ = 74590897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74591449) 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, 12431899 + ... + 12431904.

It is an arithmetic number, because the mean of its divisors is an integer number (24863804).

Almost surely, 2^74591409 is an apocalyptic number.

It is an amenable number.

74591409 is a deficient number, since it is larger than the sum of its proper divisors (24863807).

74591409 is a wasteful number, since it uses less digits than its factorization.

74591409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24863806.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 74591409 is about 8636.6318087551. The cubic root of 74591409 is about 420.9491177365.

The spelling of 74591409 in words is "seventy-four million, five hundred ninety-one thousand, four hundred nine".