2116556 has 36 divisors (see below), whose sum is σ = 4181184. Its totient is φ = 936000.

The previous prime is 2116537. The next prime is 2116559. The reversal of 2116556 is 6556112.

It is a super-2 number, since 2×2116556² = 8959618602272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (2116559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20906 + ... + 21006.

It is an arithmetic number, because the mean of its divisors is an integer number (116144).

2^2116556 is an apocalyptic number.

2116556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2116556 is a deficient number, since it is larger than the sum of its proper divisors (2064628).

2116556 is a wasteful number, since it uses less digits than its factorization.

2116556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 147 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 2116556 is about 1454.8388226879. The cubic root of 2116556 is about 128.3935640515.

2116556 divided by its sum of digits (26) gives a triangular number (81406 = T₄₀₃).

The spelling of 2116556 in words is "two million, one hundred sixteen thousand, five hundred fifty-six".