2103890 has 16 divisors (see below), whose sum is σ = 3850200. Its totient is φ = 827520.

The previous prime is 2103887. The next prime is 2103901. The reversal of 2103890 is 983012.

It can be written as a sum of positive squares in 4 ways, for example, as 395641 + 1708249 = 629^2 + 1307^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1115 + ... + 2334.

2^2103890 is an apocalyptic number.

2103890 is a deficient number, since it is larger than the sum of its proper divisors (1746310).

2103890 is a wasteful number, since it uses less digits than its factorization.

2103890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517.

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

The square root of 2103890 is about 1450.4792311509. The cubic root of 2103890 is about 128.1369384077.

The spelling of 2103890 in words is "two million, one hundred three thousand, eight hundred ninety".