74991439 has 4 divisors (see below), whose sum is σ = 75019000. Its totient is φ = 74963880.

The previous prime is 74991421. The next prime is 74991443. The reversal of 74991439 is 93419947.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93419947 = 17 ⋅5495291.

It is a cyclic number.

It is not a de Polignac number, because 74991439 - 2¹¹ = 74989391 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 (74991239) 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, 9189 + ... + 15310.

It is an arithmetic number, because the mean of its divisors is an integer number (18754750).

Almost surely, 2^74991439 is an apocalyptic number.

74991439 is a deficient number, since it is larger than the sum of its proper divisors (27561).

74991439 is a wasteful number, since it uses less digits than its factorization.

74991439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27560.

The product of its digits is 244944, while the sum is 46.

The square root of 74991439 is about 8659.7597541733. The cubic root of 74991439 is about 421.7002862024.

The spelling of 74991439 in words is "seventy-four million, nine hundred ninety-one thousand, four hundred thirty-nine".