84248009 has 4 divisors (see below), whose sum is σ = 84292560. Its totient is φ = 84203460.

The previous prime is 84247997. The next prime is 84248029. The reversal of 84248009 is 90084248.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84248009 - 2⁸ = 84247753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84248009.

It is not an unprimeable number, because it can be changed into a prime (84248029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19307 + ... + 23264.

It is an arithmetic number, because the mean of its divisors is an integer number (21073140).

Almost surely, 2^84248009 is an apocalyptic number.

It is an amenable number.

84248009 is a deficient number, since it is larger than the sum of its proper divisors (44551).

84248009 is a wasteful number, since it uses less digits than its factorization.

84248009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44550.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 84248009 is about 9178.6714180212. The cubic root of 84248009 is about 438.3825064308.

The spelling of 84248009 in words is "eighty-four million, two hundred forty-eight thousand, nine".