2155836 has 48 divisors (see below), whose sum is σ = 5370624. Its totient is φ = 671616.

The previous prime is 2155799. The next prime is 2155837. The reversal of 2155836 is 6385512.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20095 + ... + 20201.

It is an arithmetic number, because the mean of its divisors is an integer number (111888).

2^2155836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2685312).

2155836 is an abundant number, since it is smaller than the sum of its proper divisors (3214788).

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

2155836 is a wasteful number, since it uses less digits than its factorization.

2155836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 208 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 2155836 is about 1468.2765407102. The cubic root of 2155836 is about 129.1829625411.

The spelling of 2155836 in words is "two million, one hundred fifty-five thousand, eight hundred thirty-six".