84231009 has 40 divisors (see below), whose sum is σ = 133584000. Its totient is φ = 52744608.

The previous prime is 84231001. The next prime is 84231019. The reversal of 84231009 is 90013248.

It is not a de Polignac number, because 84231009 - 2³ = 84231001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (84231001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 352312 + ... + 352550.

It is an arithmetic number, because the mean of its divisors is an integer number (3339600).

Almost surely, 2^84231009 is an apocalyptic number.

It is an amenable number.

84231009 is a deficient number, since it is larger than the sum of its proper divisors (49352991).

84231009 is a wasteful number, since it uses less digits than its factorization.

84231009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 84231009 is about 9177.7453113496. The cubic root of 84231009 is about 438.3530180824.

The spelling of 84231009 in words is "eighty-four million, two hundred thirty-one thousand, nine".