84870989 has 12 divisors (see below), whose sum is σ = 103021344. Its totient is φ = 69582744.

The previous prime is 84870979. The next prime is 84870991. The reversal of 84870989 is 98907848.

It is a de Polignac number, because none of the positive numbers 2^k-84870989 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 84870989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84870959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36527 + ... + 38780.

It is an arithmetic number, because the mean of its divisors is an integer number (8585112).

Almost surely, 2^84870989 is an apocalyptic number.

It is an amenable number.

84870989 is a deficient number, since it is larger than the sum of its proper divisors (18150355).

84870989 is a wasteful number, since it uses less digits than its factorization.

84870989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75344 (or 75337 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 84870989 is about 9212.5451966327. The cubic root of 84870989 is about 439.4604077586.

The spelling of 84870989 in words is "eighty-four million, eight hundred seventy thousand, nine hundred eighty-nine".