2156018 has 4 divisors (see below), whose sum is σ = 3234030. Its totient is φ = 1078008.

The previous prime is 2156017. The next prime is 2156023. The reversal of 2156018 is 8106512.

2156018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1787569 + 368449 = 1337^2 + 607^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2155984 and 2156002.

It is not an unprimeable number, because it can be changed into a prime (2156017) by changing a digit.

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 as a sum of consecutive naturals, namely, 539003 + ... + 539006.

2^2156018 is an apocalyptic number.

2156018 is a deficient number, since it is larger than the sum of its proper divisors (1078012).

2156018 is a wasteful number, since it uses less digits than its factorization.

2156018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078011.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2156018 is about 1468.3385168278. The cubic root of 2156018 is about 129.1865977337.

The spelling of 2156018 in words is "two million, one hundred fifty-six thousand, eighteen".