74389409 has 4 divisors (see below), whose sum is σ = 75408516. Its totient is φ = 73370304.

The previous prime is 74389373. The next prime is 74389459. The reversal of 74389409 is 90498347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90498347 = 8273 ⋅10939.

It can be written as a sum of positive squares in 2 ways, for example, as 54390625 + 19998784 = 7375^2 + 4472^2 .

It is a cyclic number.

It is not a de Polignac number, because 74389409 - 2²⁰ = 73340833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74389409.

It is not an unprimeable number, because it can be changed into a prime (74389459) 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, 509444 + ... + 509589.

It is an arithmetic number, because the mean of its divisors is an integer number (18852129).

Almost surely, 2^74389409 is an apocalyptic number.

It is an amenable number.

74389409 is a deficient number, since it is larger than the sum of its proper divisors (1019107).

74389409 is a wasteful number, since it uses less digits than its factorization.

74389409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019106.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 74389409 is about 8624.9295069583. The cubic root of 74389409 is about 420.5687853078.

The spelling of 74389409 in words is "seventy-four million, three hundred eighty-nine thousand, four hundred nine".