2138181 has 8 divisors (see below), whose sum is σ = 2877984. Its totient is φ = 1411920.

The previous prime is 2138167. The next prime is 2138189. The reversal of 2138181 is 1818312.

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

It is not a de Polignac number, because 2138181 - 2⁹ = 2137669 is a prime.

It is a super-2 number, since 2×2138181² = 9143635977522, which contains 22 as substring.

2138181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138189) 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, 3010 + ... + 3651.

It is an arithmetic number, because the mean of its divisors is an integer number (359748).

2^2138181 is an apocalyptic number.

It is an amenable number.

2138181 is a deficient number, since it is larger than the sum of its proper divisors (739803).

2138181 is a wasteful number, since it uses less digits than its factorization.

2138181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6771.

The product of its digits is 384, while the sum is 24.

The square root of 2138181 is about 1462.2520302602. The cubic root of 2138181 is about 128.8293519066.

The spelling of 2138181 in words is "two million, one hundred thirty-eight thousand, one hundred eighty-one".