655138 has 16 divisors (see below), whose sum is σ = 1086624. Its totient is φ = 293760.

The previous prime is 655121. The next prime is 655157. The reversal of 655138 is 831556.

It is an unprimeable number.

655138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1981 + ... + 2287.

It is an arithmetic number, because the mean of its divisors is an integer number (67914).

2⁶⁵⁵¹³⁸ is an apocalyptic number.

655138 is a deficient number, since it is larger than the sum of its proper divisors (431486).

655138 is a wasteful number, since it uses less digits than its factorization.

655138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417.

The product of its digits is 3600, while the sum is 28.

The square root of 655138 is about 809.4059550065. The cubic root of 655138 is about 86.8515546691.

The spelling of 655138 in words is "six hundred fifty-five thousand, one hundred thirty-eight".