2109156 has 72 divisors (see below), whose sum is σ = 6090336. Its totient is φ = 564480.

The previous prime is 2109127. The next prime is 2109161. The reversal of 2109156 is 6519012.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9891 + ... + 10101.

It is an arithmetic number, because the mean of its divisors is an integer number (84588).

2^2109156 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 2109156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3045168).

2109156 is an abundant number, since it is smaller than the sum of its proper divisors (3981180).

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

2109156 is a wasteful number, since it uses less digits than its factorization.

2109156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 2109156 is about 1452.2933587950. The cubic root of 2109156 is about 128.2437575096.

The spelling of 2109156 in words is "two million, one hundred nine thousand, one hundred fifty-six".