84739819 has 2 divisors, whose sum is σ = 84739820. Its totient is φ = 84739818.

The previous prime is 84739813. The next prime is 84739901. The reversal of 84739819 is 91893748.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84739819 - 2²¹ = 82642667 is a prime.

It is a super-2 number, since 2×84739819² = 14361673848305522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84739813) 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, 42369909 + 42369910.

It is an arithmetic number, because the mean of its divisors is an integer number (42369910).

Almost surely, 2^84739819 is an apocalyptic number.

84739819 is a deficient number, since it is larger than the sum of its proper divisors (1).

84739819 is an equidigital number, since it uses as much as digits as its factorization.

84739819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 84739819 is about 9205.4233471362. The cubic root of 84739819 is about 439.2338924142.

It can be divided in two parts, 84739 and 819, that added together give a palindrome (85558).

The spelling of 84739819 in words is "eighty-four million, seven hundred thirty-nine thousand, eight hundred nineteen".