2181902 has 8 divisors (see below), whose sum is σ = 3385800. Its totient is φ = 1053304.

The previous prime is 2181889. The next prime is 2181919. The reversal of 2181902 is 2091812.

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

It is a zygodrome in base 6.

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, 18752 + ... + 18867.

It is an arithmetic number, because the mean of its divisors is an integer number (423225).

2^2181902 is an apocalyptic number.

2181902 is a deficient number, since it is larger than the sum of its proper divisors (1203898).

2181902 is a wasteful number, since it uses less digits than its factorization.

2181902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37650.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2181902 is about 1477.1262640682. The cubic root of 2181902 is about 129.7015243071.

The spelling of 2181902 in words is "two million, one hundred eighty-one thousand, nine hundred two".