74389643 has 2 divisors, whose sum is σ = 74389644. Its totient is φ = 74389642.

The previous prime is 74389597. The next prime is 74389657. The reversal of 74389643 is 34698347.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74389643 - 2¹² = 74385547 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 74389594 and 74389603.

It is not a weakly prime, because it can be changed into another prime (74389543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37194821 + 37194822.

It is an arithmetic number, because the mean of its divisors is an integer number (37194822).

Almost surely, 2^74389643 is an apocalyptic number.

74389643 is a deficient number, since it is larger than the sum of its proper divisors (1).

74389643 is an equidigital number, since it uses as much as digits as its factorization.

74389643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 44.

The square root of 74389643 is about 8624.9430722759. The cubic root of 74389643 is about 420.5692262890.

The spelling of 74389643 in words is "seventy-four million, three hundred eighty-nine thousand, six hundred forty-three".