84490123 has 2 divisors, whose sum is σ = 84490124. Its totient is φ = 84490122.

The previous prime is 84490111. The next prime is 84490139. The reversal of 84490123 is 32109448.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84490123 is a prime.

It is not a weakly prime, because it can be changed into another prime (84490163) 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, 42245061 + 42245062.

It is an arithmetic number, because the mean of its divisors is an integer number (42245062).

Almost surely, 2^84490123 is an apocalyptic number.

84490123 is a deficient number, since it is larger than the sum of its proper divisors (1).

84490123 is an equidigital number, since it uses as much as digits as its factorization.

84490123 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 31.

The square root of 84490123 is about 9191.8509017499. The cubic root of 84490123 is about 438.8020495984.

The spelling of 84490123 in words is "eighty-four million, four hundred ninety thousand, one hundred twenty-three".