2101854 has 16 divisors (see below), whose sum is σ = 4236048. Its totient is φ = 695232.

The previous prime is 2101849. The next prime is 2101867. The reversal of 2101854 is 4581012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2101854.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 457 + ... + 2100.

It is an arithmetic number, because the mean of its divisors is an integer number (264753).

2^2101854 is an apocalyptic number.

2101854 is an abundant number, since it is smaller than the sum of its proper divisors (2134194).

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

2101854 is a wasteful number, since it uses less digits than its factorization.

2101854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 2101854 is about 1449.7772242659. Note that the first 3 decimals coincide. The cubic root of 2101854 is about 128.0955910293.

Adding to 2101854 its reverse (4581012), we get a palindrome (6682866).

The spelling of 2101854 in words is "two million, one hundred one thousand, eight hundred fifty-four".