840005134 has 8 divisors (see below), whose sum is σ = 1265028408. Its totient is φ = 418329000.

The previous prime is 840005119. The next prime is 840005147. The reversal of 840005134 is 431500048.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 840005099 and 840005108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 836157 + ... + 837160.

It is an arithmetic number, because the mean of its divisors is an integer number (158128551).

Almost surely, 2^840005134 is an apocalyptic number.

840005134 is a deficient number, since it is larger than the sum of its proper divisors (425023274).

840005134 is a wasteful number, since it uses less digits than its factorization.

840005134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673570.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 840005134 is about 28982.8420621581. The cubic root of 840005134 is about 943.5407183325.

The spelling of 840005134 in words is "eight hundred forty million, five thousand, one hundred thirty-four".