84972909 has 12 divisors (see below), whose sum is σ = 131794944. Its totient is φ = 48555864.

The previous prime is 84972889. The next prime is 84972913. The reversal of 84972909 is 90927948.

It is a happy number.

It is not a de Polignac number, because 84972909 - 2¹¹ = 84970861 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84972989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288877 + ... + 289170.

It is an arithmetic number, because the mean of its divisors is an integer number (10982912).

Almost surely, 2^84972909 is an apocalyptic number.

It is an amenable number.

84972909 is a deficient number, since it is larger than the sum of its proper divisors (46822035).

84972909 is a wasteful number, since it uses less digits than its factorization.

84972909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578064 (or 578057 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 84972909 is about 9218.0751244498. The cubic root of 84972909 is about 439.6362506788.

The spelling of 84972909 in words is "eighty-four million, nine hundred seventy-two thousand, nine hundred nine".