84631989 has 24 divisors (see below), whose sum is σ = 123795840. Its totient is φ = 51397632.

The previous prime is 84631979. The next prime is 84631991. The reversal of 84631989 is 98913648.

It is not a de Polignac number, because 84631989 - 2¹⁶ = 84566453 is a prime.

It is a super-2 number, since 2×84631989² = 14325147124192242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84631979) 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 23 ways as a sum of consecutive naturals, for example, 38997 + ... + 41109.

It is an arithmetic number, because the mean of its divisors is an integer number (5158160).

Almost surely, 2^84631989 is an apocalyptic number.

It is an amenable number.

84631989 is a deficient number, since it is larger than the sum of its proper divisors (39163851).

84631989 is a wasteful number, since it uses less digits than its factorization.

84631989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221 (or 2208 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 84631989 is about 9199.5646092628. The cubic root of 84631989 is about 439.0475074114.

The spelling of 84631989 in words is "eighty-four million, six hundred thirty-one thousand, nine hundred eighty-nine".