2145858 has 64 divisors (see below), whose sum is σ = 5249664. Its totient is φ = 576000.

The previous prime is 2145853. The next prime is 2145937. The reversal of 2145858 is 8585412.

It is a Harshad number since it is a multiple of its sum of digits (33).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2145853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35148 + ... + 35208.

It is an arithmetic number, because the mean of its divisors is an integer number (82026).

2^2145858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2624832).

2145858 is an abundant number, since it is smaller than the sum of its proper divisors (3103806).

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

2145858 is a wasteful number, since it uses less digits than its factorization.

2145858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131.

The product of its digits is 12800, while the sum is 33.

The square root of 2145858 is about 1464.8747386722. The cubic root of 2145858 is about 128.9833522174.

It can be divided in two parts, 2145 and 858, that added together give a palindrome (3003).

The spelling of 2145858 in words is "two million, one hundred forty-five thousand, eight hundred fifty-eight".