74421639 has 8 divisors (see below), whose sum is σ = 110254320. Its totient is φ = 49614408.

The previous prime is 74421637. The next prime is 74421643. The reversal of 74421639 is 93612447.

It is not a de Polignac number, because 74421639 - 2¹ = 74421637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74421637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1378152 + ... + 1378205.

It is an arithmetic number, because the mean of its divisors is an integer number (13781790).

Almost surely, 2^74421639 is an apocalyptic number.

74421639 is a deficient number, since it is larger than the sum of its proper divisors (35832681).

74421639 is a wasteful number, since it uses less digits than its factorization.

74421639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756366 (or 2756360 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 74421639 is about 8626.7977256917. The cubic root of 74421639 is about 420.6295151662.

The spelling of 74421639 in words is "seventy-four million, four hundred twenty-one thousand, six hundred thirty-nine".