74840389 has 4 divisors (see below), whose sum is σ = 80597356. Its totient is φ = 69083424.

The previous prime is 74840377. The next prime is 74840393. The reversal of 74840389 is 98304847.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98304847 = 227 ⋅433061.

It can be written as a sum of positive squares in 2 ways, for example, as 25250625 + 49589764 = 5025^2 + 7042^2 .

It is a cyclic number.

It is not a de Polignac number, because 74840389 - 2⁵ = 74840357 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 (74840369) 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, 2878464 + ... + 2878489.

It is an arithmetic number, because the mean of its divisors is an integer number (20149339).

Almost surely, 2^74840389 is an apocalyptic number.

It is an amenable number.

74840389 is a deficient number, since it is larger than the sum of its proper divisors (5756967).

74840389 is a wasteful number, since it uses less digits than its factorization.

74840389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5756966.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 74840389 is about 8651.0339844437. The cubic root of 74840389 is about 421.4169621130.

The spelling of 74840389 in words is "seventy-four million, eight hundred forty thousand, three hundred eighty-nine".