2118690 has 128 divisors (see below), whose sum is σ = 6912000. Its totient is φ = 451008.

The previous prime is 2118689. The next prime is 2118703. The reversal of 2118690 is 968112.

It is a super-2 number, since 2×2118690² = 8977694632200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35881 + ... + 35939.

It is an arithmetic number, because the mean of its divisors is an integer number (54000).

2^2118690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2118690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3456000).

2118690 is an abundant number, since it is smaller than the sum of its proper divisors (4793310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2118690 is a wasteful number, since it uses less digits than its factorization.

2118690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2118690 is about 1455.5720524935. The cubic root of 2118690 is about 128.4367001389.

The spelling of 2118690 in words is "two million, one hundred eighteen thousand, six hundred ninety".