83400643 has 2 divisors, whose sum is σ = 83400644. Its totient is φ = 83400642.

The previous prime is 83400631. The next prime is 83400659. The reversal of 83400643 is 34600438.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83400643 is a prime.

It is not a weakly prime, because it can be changed into another prime (83400613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41700321 + 41700322.

It is an arithmetic number, because the mean of its divisors is an integer number (41700322).

Almost surely, 2^83400643 is an apocalyptic number.

83400643 is a deficient number, since it is larger than the sum of its proper divisors (1).

83400643 is an equidigital number, since it uses as much as digits as its factorization.

83400643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 83400643 is about 9132.3952498783. The cubic root of 83400643 is about 436.9078015394.

The spelling of 83400643 in words is "eighty-three million, four hundred thousand, six hundred forty-three".