201870 has 24 divisors (see below), whose sum is σ = 525096. Its totient is φ = 53808.

The previous prime is 201847. The next prime is 201881. The reversal of 201870 is 78102.

201870 is nontrivially palindromic in base 8.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

201870 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 11 ways as a sum of consecutive naturals, for example, 1032 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (21879).

2²⁰¹⁸⁷⁰ is an apocalyptic number.

201870 is an abundant number, since it is smaller than the sum of its proper divisors (323226).

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

201870 is a wasteful number, since it uses less digits than its factorization.

201870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256 (or 2253 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 201870 is about 449.2994547070. The cubic root of 201870 is about 58.6620534136.

Adding to 201870 its reverse (78102), we get a palindrome (279972).

The spelling of 201870 in words is "two hundred one thousand, eight hundred seventy".