84040005 has 32 divisors (see below), whose sum is σ = 156204288. Its totient is φ = 37785600.

The previous prime is 84039997. The next prime is 84040007. The reversal of 84040005 is 50004048.

It is not a de Polignac number, because 84040005 - 2³ = 84039997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84040007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156 + ... + 12965.

It is an arithmetic number, because the mean of its divisors is an integer number (4881384).

Almost surely, 2^84040005 is an apocalyptic number.

It is an amenable number.

84040005 is a deficient number, since it is larger than the sum of its proper divisors (72164283).

84040005 is a wasteful number, since it uses less digits than its factorization.

84040005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13197.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 84040005 is about 9167.3335818001. Note that the first 3 decimals coincide. The cubic root of 84040005 is about 438.0214278210.

The spelling of 84040005 in words is "eighty-four million, forty thousand, five".