657138 has 16 divisors (see below), whose sum is σ = 1357056. Its totient is φ = 211920.

The previous prime is 657131. The next prime is 657187. The reversal of 657138 is 831756.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 657138.

It is not an unprimeable number, because it can be changed into a prime (657131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1581 + ... + 1952.

It is an arithmetic number, because the mean of its divisors is an integer number (84816).

2⁶⁵⁷¹³⁸ is an apocalyptic number.

657138 is an abundant number, since it is smaller than the sum of its proper divisors (699918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

657138 is a wasteful number, since it uses less digits than its factorization.

657138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3569.

The product of its digits is 5040, while the sum is 30.

The square root of 657138 is about 810.6404875159. The cubic root of 657138 is about 86.9398447946.

The spelling of 657138 in words is "six hundred fifty-seven thousand, one hundred thirty-eight".