210138 has 8 divisors (see below), whose sum is σ = 420288. Its totient is φ = 70044.

The previous prime is 210131. The next prime is 210139. The reversal of 210138 is 831012.

It is a happy number.

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

210138 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 210138.

It is not an unprimeable number, because it can be changed into a prime (210131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17506 + ... + 17517.

It is an arithmetic number, because the mean of its divisors is an integer number (52536).

2²¹⁰¹³⁸ is an apocalyptic number.

210138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

210138 is a wasteful number, since it uses less digits than its factorization.

210138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35028.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 210138 is about 458.4081151114. The cubic root of 210138 is about 59.4522366962.

The spelling of 210138 in words is "two hundred ten thousand, one hundred thirty-eight".