84638623 has 2 divisors, whose sum is σ = 84638624. Its totient is φ = 84638622.

The previous prime is 84638579. The next prime is 84638633. The reversal of 84638623 is 32683648.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84638623 - 2⁹ = 84638111 is a prime.

It is a super-2 number, since 2×84638623² = 14327393006672258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84638633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42319311 + 42319312.

It is an arithmetic number, because the mean of its divisors is an integer number (42319312).

Almost surely, 2^84638623 is an apocalyptic number.

84638623 is a deficient number, since it is larger than the sum of its proper divisors (1).

84638623 is an equidigital number, since it uses as much as digits as its factorization.

84638623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 40.

The square root of 84638623 is about 9199.9251627391. The cubic root of 84638623 is about 439.0589789014.

The spelling of 84638623 in words is "eighty-four million, six hundred thirty-eight thousand, six hundred twenty-three".