2157118 has 4 divisors (see below), whose sum is σ = 3235680. Its totient is φ = 1078558.

The previous prime is 2157109. The next prime is 2157119. The reversal of 2157118 is 8117512.

2157118 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 is a junction number, because it is equal to n+sod(n) for n = 2157092 and 2157101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157119) 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, 539278 + ... + 539281.

It is an arithmetic number, because the mean of its divisors is an integer number (808920).

2^2157118 is an apocalyptic number.

2157118 is a deficient number, since it is larger than the sum of its proper divisors (1078562).

2157118 is a wasteful number, since it uses less digits than its factorization.

2157118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078561.

The product of its digits is 560, while the sum is 25.

The square root of 2157118 is about 1468.7130420882. The cubic root of 2157118 is about 129.2085643248.

The spelling of 2157118 in words is "two million, one hundred fifty-seven thousand, one hundred eighteen".