84247989 has 16 divisors (see below), whose sum is σ = 131510400. Its totient is φ = 46967040.

The previous prime is 84247981. The next prime is 84247991. The reversal of 84247989 is 98974248.

It is not a de Polignac number, because 84247989 - 2³ = 84247981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84247981) 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, 48064 + ... + 49785.

It is an arithmetic number, because the mean of its divisors is an integer number (8219400).

Almost surely, 2^84247989 is an apocalyptic number.

It is an amenable number.

84247989 is a deficient number, since it is larger than the sum of its proper divisors (47262411).

84247989 is a wasteful number, since it uses less digits than its factorization.

84247989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97900.

The product of its digits is 1161216, while the sum is 51.

The square root of 84247989 is about 9178.6703285389. The cubic root of 84247989 is about 438.3824717410.

The spelling of 84247989 in words is "eighty-four million, two hundred forty-seven thousand, nine hundred eighty-nine".