84974839 has 2 divisors, whose sum is σ = 84974840. Its totient is φ = 84974838.

The previous prime is 84974833. The next prime is 84974863. The reversal of 84974839 is 93847948.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84974839 - 2³ = 84974831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84974831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42487419 + 42487420.

It is an arithmetic number, because the mean of its divisors is an integer number (42487420).

Almost surely, 2^84974839 is an apocalyptic number.

84974839 is a deficient number, since it is larger than the sum of its proper divisors (1).

84974839 is an equidigital number, since it uses as much as digits as its factorization.

84974839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The square root of 84974839 is about 9218.1798094852. The cubic root of 84974839 is about 439.6395791574.

The spelling of 84974839 in words is "eighty-four million, nine hundred seventy-four thousand, eight hundred thirty-nine".