2190385 has 8 divisors (see below), whose sum is σ = 2641320. Its totient is φ = 1743744.

The previous prime is 2190371. The next prime is 2190389. The reversal of 2190385 is 5830912.

It can be written as a sum of positive squares in 4 ways, for example, as 1106704 + 1083681 = 1052^2 + 1041^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2190385 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2190389) 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, 189 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (330165).

2^2190385 is an apocalyptic number.

It is an amenable number.

2190385 is a deficient number, since it is larger than the sum of its proper divisors (450935).

2190385 is a wasteful number, since it uses less digits than its factorization.

2190385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2190385 is about 1479.9949324238. The cubic root of 2190385 is about 129.8693954593.

The spelling of 2190385 in words is "two million, one hundred ninety thousand, three hundred eighty-five".