2181042 has 12 divisors (see below), whose sum is σ = 4725630. Its totient is φ = 727008.

The previous prime is 2181031. The next prime is 2181071. The reversal of 2181042 is 2401812.

It can be written as a sum of positive squares in only one way, i.e., 1879641 + 301401 = 1371^2 + 549^2 .

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: 121169 = 2181042 / (2 + 1 + 8 + 1 + 0 + 4 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60567 + ... + 60602.

2^2181042 is an apocalyptic number.

2181042 is an abundant number, since it is smaller than the sum of its proper divisors (2544588).

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

2181042 is a wasteful number, since it uses less digits than its factorization.

2181042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121177 (or 121174 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2181042 is about 1476.8351295930. The cubic root of 2181042 is about 129.6844813833.

Adding to 2181042 its reverse (2401812), we get a palindrome (4582854).

The spelling of 2181042 in words is "two million, one hundred eighty-one thousand, forty-two".