181206 has 12 divisors (see below), whose sum is σ = 392652. Its totient is φ = 60396.

The previous prime is 181201. The next prime is 181211. The reversal of 181206 is 602181.

It is an interprime number because it is at equal distance from previous prime (181201) and next prime (181211).

It is a super-2 number, since 2×181206² = 65671228872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 10067 = 181206 / (1 + 8 + 1 + 2 + 0 + 6).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 181206.

It is not an unprimeable number, because it can be changed into a prime (181201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5016 + ... + 5051.

It is an arithmetic number, because the mean of its divisors is an integer number (32721).

2¹⁸¹²⁰⁶ is an apocalyptic number.

181206 is an abundant number, since it is smaller than the sum of its proper divisors (211446).

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

181206 is a wasteful number, since it uses less digits than its factorization.

181206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10075 (or 10072 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 181206 is about 425.6829806323. The cubic root of 181206 is about 56.5879799836.

Adding to 181206 its reverse (602181), we get a palindrome (783387).

The spelling of 181206 in words is "one hundred eighty-one thousand, two hundred six".