84447989 has 8 divisors (see below), whose sum is σ = 89058240. Its totient is φ = 79854336.

The previous prime is 84447983. The next prime is 84447991. The reversal of 84447989 is 98974448.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84447989 - 2²⁰ = 83399413 is a prime.

It is a super-2 number, since 2×84447989² = 14262925692288242, which contains 22 as substring.

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 84447989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84447983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7112 + ... + 14814.

It is an arithmetic number, because the mean of its divisors is an integer number (11132280).

Almost surely, 2^84447989 is an apocalyptic number.

It is an amenable number.

84447989 is a deficient number, since it is larger than the sum of its proper divisors (4610251).

84447989 is a wasteful number, since it uses less digits than its factorization.

84447989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8299.

The product of its digits is 2322432, while the sum is 53.

The square root of 84447989 is about 9189.5586945185. The cubic root of 84447989 is about 438.7290960623.

The spelling of 84447989 in words is "eighty-four million, four hundred forty-seven thousand, nine hundred eighty-nine".