2158766 has 4 divisors (see below), whose sum is σ = 3238152. Its totient is φ = 1079382.

The previous prime is 2158763. The next prime is 2158769. The reversal of 2158766 is 6678512.

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

It is an interprime number because it is at equal distance from previous prime (2158763) and next prime (2158769).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539690 + ... + 539693.

It is an arithmetic number, because the mean of its divisors is an integer number (809538).

2^2158766 is an apocalyptic number.

2158766 is a deficient number, since it is larger than the sum of its proper divisors (1079386).

2158766 is a wasteful number, since it uses less digits than its factorization.

2158766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079385.

The product of its digits is 20160, while the sum is 35.

The square root of 2158766 is about 1469.2739703677. The cubic root of 2158766 is about 129.2414603015.

The spelling of 2158766 in words is "two million, one hundred fifty-eight thousand, seven hundred sixty-six".