84090909 has 32 divisors (see below), whose sum is σ = 132710400. Its totient is φ = 47334000.

The previous prime is 84090863. The next prime is 84090911. The reversal of 84090909 is 90909048.

It is not a de Polignac number, because 84090909 - 2⁷ = 84090781 is a prime.

84090909 is a modest number, since divided by 90909 gives 84 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84090709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72484 + ... + 73634.

It is an arithmetic number, because the mean of its divisors is an integer number (4147200).

Almost surely, 2^84090909 is an apocalyptic number.

It is an amenable number.

84090909 is a deficient number, since it is larger than the sum of its proper divisors (48619491).

84090909 is a wasteful number, since it uses less digits than its factorization.

84090909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246 (or 1232 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 84090909 is about 9170.1095413305. The cubic root of 84090909 is about 438.1098481807.

The spelling of 84090909 in words is "eighty-four million, ninety thousand, nine hundred nine".