84135379 has 2 divisors, whose sum is σ = 84135380. Its totient is φ = 84135378.

The previous prime is 84135377. The next prime is 84135413. The reversal of 84135379 is 97353148.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84135379 - 2¹ = 84135377 is a prime.

Together with 84135377, it forms a pair of twin primes.

It is equal to p_4896490 and since 84135379 and 4896490 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (84135371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42067689 + 42067690.

It is an arithmetic number, because the mean of its divisors is an integer number (42067690).

Almost surely, 2^84135379 is an apocalyptic number.

84135379 is a deficient number, since it is larger than the sum of its proper divisors (1).

84135379 is an equidigital number, since it uses as much as digits as its factorization.

84135379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 84135379 is about 9172.5339465166. The cubic root of 84135379 is about 438.1870634700.

The spelling of 84135379 in words is "eighty-four million, one hundred thirty-five thousand, three hundred seventy-nine".