2091858 has 8 divisors (see below), whose sum is σ = 4183728. Its totient is φ = 697284.

The previous prime is 2091851. The next prime is 2091863. The reversal of 2091858 is 8581902.

It is a happy number.

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

2091858 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (2091851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174316 + ... + 174327.

It is an arithmetic number, because the mean of its divisors is an integer number (522966).

2^2091858 is an apocalyptic number.

2091858 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2091858 is a wasteful number, since it uses less digits than its factorization.

2091858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348648.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 2091858 is about 1446.3256894628. The cubic root of 2091858 is about 127.8922025362.

The spelling of 2091858 in words is "two million, ninety-one thousand, eight hundred fifty-eight".