656138 has 8 divisors (see below), whose sum is σ = 1124832. Its totient is φ = 281196.

The previous prime is 656129. The next prime is 656141. The reversal of 656138 is 831656.

656138 is nontrivially palindromic in base 16.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 656138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23420 + ... + 23447.

It is an arithmetic number, because the mean of its divisors is an integer number (140604).

2⁶⁵⁶¹³⁸ is an apocalyptic number.

656138 is a deficient number, since it is larger than the sum of its proper divisors (468694).

656138 is a wasteful number, since it uses less digits than its factorization.

656138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46876.

The product of its digits is 4320, while the sum is 29.

The square root of 656138 is about 810.0234564505. The cubic root of 656138 is about 86.8957221586.

The spelling of 656138 in words is "six hundred fifty-six thousand, one hundred thirty-eight".