84211909 has 8 divisors (see below), whose sum is σ = 86929920. Its totient is φ = 81525600.

The previous prime is 84211871. The next prime is 84211913. The reversal of 84211909 is 90911248.

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 84211909 - 2⁹ = 84211397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84211949) 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, 2469 + ... + 13210.

It is an arithmetic number, because the mean of its divisors is an integer number (10866240).

Almost surely, 2^84211909 is an apocalyptic number.

It is an amenable number.

84211909 is a deficient number, since it is larger than the sum of its proper divisors (2718011).

84211909 is a wasteful number, since it uses less digits than its factorization.

84211909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15851.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 84211909 is about 9176.7046917725. The cubic root of 84211909 is about 438.3198823221.

The spelling of 84211909 in words is "eighty-four million, two hundred eleven thousand, nine hundred nine".