84252009 has 16 divisors (see below), whose sum is σ = 114124032. Its totient is φ = 55281408.

The previous prime is 84251987. The next prime is 84252037. The reversal of 84252009 is 90025248.

It is not a de Polignac number, because 84252009 - 2¹⁷ = 84120937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84251009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52432 + ... + 54014.

It is an arithmetic number, because the mean of its divisors is an integer number (7132752).

Almost surely, 2^84252009 is an apocalyptic number.

It is an amenable number.

84252009 is a deficient number, since it is larger than the sum of its proper divisors (29872023).

84252009 is a wasteful number, since it uses less digits than its factorization.

84252009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 84252009 is about 9178.8893118939. The cubic root of 84252009 is about 438.3894442893.

The spelling of 84252009 in words is "eighty-four million, two hundred fifty-two thousand, nine".