2181436 has 12 divisors (see below), whose sum is σ = 3828328. Its totient is φ = 1087632.

The previous prime is 2181419. The next prime is 2181449. The reversal of 2181436 is 6341812.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2181436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690 + ... + 2686.

2^2181436 is an apocalyptic number.

It is an amenable number.

2181436 is a deficient number, since it is larger than the sum of its proper divisors (1646892).

2181436 is a wasteful number, since it uses less digits than its factorization.

2181436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548 (or 1546 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 2181436 is about 1476.9685169292. The cubic root of 2181436 is about 129.6922899765.

The spelling of 2181436 in words is "two million, one hundred eighty-one thousand, four hundred thirty-six".