84399569 has 2 divisors, whose sum is σ = 84399570. Its totient is φ = 84399568.

The previous prime is 84399563. The next prime is 84399619. The reversal of 84399569 is 96599348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84364225 + 35344 = 9185^2 + 188^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84399569 is a prime.

It is a super-2 number, since 2×84399569² = 14246574494771522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84399569.

It is not a weakly prime, because it can be changed into another prime (84399563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42199784 + 42199785.

It is an arithmetic number, because the mean of its divisors is an integer number (42199785).

Almost surely, 2^84399569 is an apocalyptic number.

It is an amenable number.

84399569 is a deficient number, since it is larger than the sum of its proper divisors (1).

84399569 is an equidigital number, since it uses as much as digits as its factorization.

84399569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 53.

The square root of 84399569 is about 9186.9238050612. The cubic root of 84399569 is about 438.6452285660.

The spelling of 84399569 in words is "eighty-four million, three hundred ninety-nine thousand, five hundred sixty-nine".