84989709 has 16 divisors (see below), whose sum is σ = 143898240. Its totient is φ = 48565440.

The previous prime is 84989699. The next prime is 84989713. The reversal of 84989709 is 90798948.

It is not a de Polignac number, because 84989709 - 2⁸ = 84989453 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84989789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224652 + ... + 225029.

It is an arithmetic number, because the mean of its divisors is an integer number (8993640).

Almost surely, 2^84989709 is an apocalyptic number.

It is an amenable number.

84989709 is a deficient number, since it is larger than the sum of its proper divisors (58908531).

84989709 is a wasteful number, since it uses less digits than its factorization.

84989709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449697 (or 449691 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 84989709 is about 9218.9863325639. The cubic root of 84989709 is about 439.6652222745.

The spelling of 84989709 in words is "eighty-four million, nine hundred eighty-nine thousand, seven hundred nine".