84391645 has 8 divisors (see below), whose sum is σ = 109060056. Its totient is φ = 62319936.

The previous prime is 84391603. The next prime is 84391667. The reversal of 84391645 is 54619348.

It can be written as a sum of positive squares in 4 ways, for example, as 4485924 + 79905721 = 2118^2 + 8939^2 .

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 84391645 - 2¹⁵ = 84358877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84391598 and 84391607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 649102 + ... + 649231.

It is an arithmetic number, because the mean of its divisors is an integer number (13632507).

Almost surely, 2^84391645 is an apocalyptic number.

It is an amenable number.

84391645 is a deficient number, since it is larger than the sum of its proper divisors (24668411).

84391645 is a wasteful number, since it uses less digits than its factorization.

84391645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298351.

The product of its digits is 103680, while the sum is 40.

The square root of 84391645 is about 9186.4925297961. The cubic root of 84391645 is about 438.6315004802.

The spelling of 84391645 in words is "eighty-four million, three hundred ninety-one thousand, six hundred forty-five".