84638837 has 2 divisors, whose sum is σ = 84638838. Its totient is φ = 84638836.

The previous prime is 84638833. The next prime is 84638839. The reversal of 84638837 is 73883648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73119601 + 11519236 = 8551^2 + 3394^2 .

It is a cyclic number.

It is not a de Polignac number, because 84638837 - 2² = 84638833 is a prime.

Together with 84638839, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 84638791 and 84638800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84638831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42319418 + 42319419.

It is an arithmetic number, because the mean of its divisors is an integer number (42319419).

Almost surely, 2^84638837 is an apocalyptic number.

It is an amenable number.

84638837 is a deficient number, since it is larger than the sum of its proper divisors (1).

84638837 is an equidigital number, since it uses as much as digits as its factorization.

84638837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 47.

The square root of 84638837 is about 9199.9367932611. The cubic root of 84638837 is about 439.0593489395.

The spelling of 84638837 in words is "eighty-four million, six hundred thirty-eight thousand, eight hundred thirty-seven".