84084989 has 4 divisors (see below), whose sum is σ = 86797440. Its totient is φ = 81372540.

The previous prime is 84084943. The next prime is 84084991. The reversal of 84084989 is 98948048.

It is a happy number.

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 84084989 - 2⁸ = 84084733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84084929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1356179 + ... + 1356240.

It is an arithmetic number, because the mean of its divisors is an integer number (21699360).

Almost surely, 2^84084989 is an apocalyptic number.

It is an amenable number.

84084989 is a deficient number, since it is larger than the sum of its proper divisors (2712451).

84084989 is a wasteful number, since it uses less digits than its factorization.

84084989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712450.

The product of its (nonzero) digits is 663552, while the sum is 50.

The square root of 84084989 is about 9169.7867477930. The cubic root of 84084989 is about 438.0995669616.

The spelling of 84084989 in words is "eighty-four million, eighty-four thousand, nine hundred eighty-nine".