74739439 has 2 divisors, whose sum is σ = 74739440. Its totient is φ = 74739438.

The previous prime is 74739421. The next prime is 74739449. The reversal of 74739439 is 93493747.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74739439 - 2¹¹ = 74737391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74739449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37369719 + 37369720.

It is an arithmetic number, because the mean of its divisors is an integer number (37369720).

Almost surely, 2^74739439 is an apocalyptic number.

74739439 is a deficient number, since it is larger than the sum of its proper divisors (1).

74739439 is an equidigital number, since it uses as much as digits as its factorization.

74739439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 46.

The square root of 74739439 is about 8645.1974529215. The cubic root of 74739439 is about 421.2273978722.

It can be divided in two parts, 747 and 39439, that added together give a triangular number (40186 = T₂₈₃).

The spelling of 74739439 in words is "seventy-four million, seven hundred thirty-nine thousand, four hundred thirty-nine".