84471945 has 16 divisors (see below), whose sum is σ = 135552960. Its totient is φ = 44919104.

The previous prime is 84471943. The next prime is 84471949. The reversal of 84471945 is 54917448.

It is a cyclic number.

It is not a de Polignac number, because 84471945 - 2¹ = 84471943 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 84471897 and 84471906.

It is not an unprimeable number, because it can be changed into a prime (84471943) 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, 2910 + ... + 13319.

It is an arithmetic number, because the mean of its divisors is an integer number (8472060).

Almost surely, 2^84471945 is an apocalyptic number.

It is an amenable number.

84471945 is a deficient number, since it is larger than the sum of its proper divisors (51081015).

84471945 is a wasteful number, since it uses less digits than its factorization.

84471945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16584.

The product of its digits is 161280, while the sum is 42.

The square root of 84471945 is about 9190.8620379157. The cubic root of 84471945 is about 438.7705780074.

The spelling of 84471945 in words is "eighty-four million, four hundred seventy-one thousand, nine hundred forty-five".