2155758 has 32 divisors (see below), whose sum is σ = 4769280. Its totient is φ = 644160.

The previous prime is 2155733. The next prime is 2155781. The reversal of 2155758 is 8575512.

It is a happy number.

2155758 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5691 + ... + 6057.

It is an arithmetic number, because the mean of its divisors is an integer number (149040).

2^2155758 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155758, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2384640).

2155758 is an abundant number, since it is smaller than the sum of its proper divisors (2613522).

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

2155758 is a wasteful number, since it uses less digits than its factorization.

2155758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472.

The product of its digits is 14000, while the sum is 33.

The square root of 2155758 is about 1468.2499787162. The cubic root of 2155758 is about 129.1814045387.

The spelling of 2155758 in words is "two million, one hundred fifty-five thousand, seven hundred fifty-eight".