84185813 has 4 divisors (see below), whose sum is σ = 84204288. Its totient is φ = 84167340.

The previous prime is 84185809. The next prime is 84185837. The reversal of 84185813 is 31858148.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84185813 - 2² = 84185809 is a prime.

It is a super-2 number, since 2×84185813² = 14174502220941938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84181813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3020 + ... + 13322.

It is an arithmetic number, because the mean of its divisors is an integer number (21051072).

Almost surely, 2^84185813 is an apocalyptic number.

It is an amenable number.

84185813 is a deficient number, since it is larger than the sum of its proper divisors (18475).

84185813 is a wasteful number, since it uses less digits than its factorization.

84185813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18474.

The product of its digits is 30720, while the sum is 38.

The square root of 84185813 is about 9175.2827204397. The cubic root of 84185813 is about 438.2746014051.

The spelling of 84185813 in words is "eighty-four million, one hundred eighty-five thousand, eight hundred thirteen".