2156506 has 16 divisors (see below), whose sum is σ = 3574368. Its totient is φ = 967600.

The previous prime is 2156491. The next prime is 2156507. The reversal of 2156506 is 6056512.

It is not an unprimeable number, because it can be changed into a prime (2156507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1236 + ... + 2416.

It is an arithmetic number, because the mean of its divisors is an integer number (223398).

2^2156506 is an apocalyptic number.

2156506 is a deficient number, since it is larger than the sum of its proper divisors (1417862).

2156506 is a wasteful number, since it uses less digits than its factorization.

2156506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2156506 is about 1468.5046816405. The cubic root of 2156506 is about 129.1963438341.

It can be divided in two parts, 2156 and 506, that added together give a palindrome (2662).

The spelling of 2156506 in words is "two million, one hundred fifty-six thousand, five hundred six".