84279709 has 2 divisors, whose sum is σ = 84279710. Its totient is φ = 84279708.

The previous prime is 84279677. The next prime is 84279719. The reversal of 84279709 is 90797248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59059225 + 25220484 = 7685^2 + 5022^2 .

It is a cyclic number.

It is not a de Polignac number, because 84279709 - 2⁵ = 84279677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84279719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42139854 + 42139855.

It is an arithmetic number, because the mean of its divisors is an integer number (42139855).

Almost surely, 2^84279709 is an apocalyptic number.

It is an amenable number.

84279709 is a deficient number, since it is larger than the sum of its proper divisors (1).

84279709 is an equidigital number, since it uses as much as digits as its factorization.

84279709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 84279709 is about 9180.3980850506. The cubic root of 84279709 is about 438.4374829342.

The spelling of 84279709 in words is "eighty-four million, two hundred seventy-nine thousand, seven hundred nine".