84867509 has 16 divisors (see below), whose sum is σ = 92347200. Its totient is φ = 77728896.

The previous prime is 84867479. The next prime is 84867511. The reversal of 84867509 is 90576848.

It is a cyclic number.

It is not a de Polignac number, because 84867509 - 2¹² = 84863413 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 (84867589) 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, 88577 + ... + 89529.

It is an arithmetic number, because the mean of its divisors is an integer number (5771700).

Almost surely, 2^84867509 is an apocalyptic number.

It is an amenable number.

84867509 is a deficient number, since it is larger than the sum of its proper divisors (7479691).

84867509 is a wasteful number, since it uses less digits than its factorization.

84867509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 84867509 is about 9212.3563218104. The cubic root of 84867509 is about 439.4544012180.

The spelling of 84867509 in words is "eighty-four million, eight hundred sixty-seven thousand, five hundred nine".