2118890 has 8 divisors (see below), whose sum is σ = 3814020. Its totient is φ = 847552.

The previous prime is 2118889. The next prime is 2118917. The reversal of 2118890 is 988112.

It can be written as a sum of positive squares in 2 ways, for example, as 1951609 + 167281 = 1397^2 + 409^2 .

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

It is a Curzon 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, 105935 + ... + 105954.

2^2118890 is an apocalyptic number.

2118890 is a deficient number, since it is larger than the sum of its proper divisors (1695130).

2118890 is a wasteful number, since it uses less digits than its factorization.

2118890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211896.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 2118890 is about 1455.6407523836. The cubic root of 2118890 is about 128.4407413989.

The spelling of 2118890 in words is "two million, one hundred eighteen thousand, eight hundred ninety".