74139689 has 8 divisors (see below), whose sum is σ = 82596360. Its totient is φ = 66076416.

The previous prime is 74139647. The next prime is 74139701. The reversal of 74139689 is 98693147.

It can be written as a sum of positive squares in 4 ways, for example, as 12250000 + 61889689 = 3500^2 + 7867^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74139689 - 2⁸ = 74139433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (74139389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97952 + ... + 98705.

It is an arithmetic number, because the mean of its divisors is an integer number (10324545).

Almost surely, 2^74139689 is an apocalyptic number.

It is an amenable number.

74139689 is a deficient number, since it is larger than the sum of its proper divisors (8456671).

74139689 is a wasteful number, since it uses less digits than its factorization.

74139689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196699.

The product of its digits is 326592, while the sum is 47.

The square root of 74139689 is about 8610.4406972001. The cubic root of 74139689 is about 420.0976511414.

The spelling of 74139689 in words is "seventy-four million, one hundred thirty-nine thousand, six hundred eighty-nine".