2181290 has 16 divisors (see below), whose sum is σ = 3944160. Its totient is φ = 868560.

The previous prime is 2181271. The next prime is 2181329. The reversal of 2181290 is 921812.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2981 + ... + 3639.

It is an arithmetic number, because the mean of its divisors is an integer number (246510).

2^2181290 is an apocalyptic number.

2181290 is a deficient number, since it is larger than the sum of its proper divisors (1762870).

2181290 is a wasteful number, since it uses less digits than its factorization.

2181290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997.

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

The square root of 2181290 is about 1476.9190905395. The cubic root of 2181290 is about 129.6893965465.

The spelling of 2181290 in words is "two million, one hundred eighty-one thousand, two hundred ninety".