2161490 has 8 divisors (see below), whose sum is σ = 3890700. Its totient is φ = 864592.

The previous prime is 2161469. The next prime is 2161493. The reversal of 2161490 is 941612.

It is a happy number.

2161490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1990921 + 170569 = 1411^2 + 413^2 .

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

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

It is not an unprimeable number, because it can be changed into a prime (2161493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108065 + ... + 108084.

2^2161490 is an apocalyptic number.

2161490 is a deficient number, since it is larger than the sum of its proper divisors (1729210).

2161490 is a wasteful number, since it uses less digits than its factorization.

2161490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216156.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2161490 is about 1470.2006665758. The cubic root of 2161490 is about 129.2957977894.

The spelling of 2161490 in words is "two million, one hundred sixty-one thousand, four hundred ninety".