74421643 has 2 divisors, whose sum is σ = 74421644. Its totient is φ = 74421642.

The previous prime is 74421637. The next prime is 74421649. The reversal of 74421643 is 34612447.

It is a balanced prime because it is at equal distance from previous prime (74421637) and next prime (74421649).

It is a cyclic number.

It is not a de Polignac number, because 74421643 - 2⁹ = 74421131 is a prime.

It is not a weakly prime, because it can be changed into another prime (74421649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37210821 + 37210822.

It is an arithmetic number, because the mean of its divisors is an integer number (37210822).

Almost surely, 2^74421643 is an apocalyptic number.

74421643 is a deficient number, since it is larger than the sum of its proper divisors (1).

74421643 is an equidigital number, since it uses as much as digits as its factorization.

74421643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 31.

The square root of 74421643 is about 8626.7979575275. The cubic root of 74421643 is about 420.6295227022.

The spelling of 74421643 in words is "seventy-four million, four hundred twenty-one thousand, six hundred forty-three".