84739813 has 2 divisors, whose sum is σ = 84739814. Its totient is φ = 84739812.

The previous prime is 84739793. The next prime is 84739819. The reversal of 84739813 is 31893748.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44315649 + 40424164 = 6657^2 + 6358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84739813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84739813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84739819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42369906 + 42369907.

It is an arithmetic number, because the mean of its divisors is an integer number (42369907).

Almost surely, 2^84739813 is an apocalyptic number.

It is an amenable number.

84739813 is a deficient number, since it is larger than the sum of its proper divisors (1).

84739813 is an equidigital number, since it uses as much as digits as its factorization.

84739813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 84739813 is about 9205.4230212413. The cubic root of 84739813 is about 439.2338820475.

The spelling of 84739813 in words is "eighty-four million, seven hundred thirty-nine thousand, eight hundred thirteen".