2166670 has 16 divisors (see below), whose sum is σ = 4254768. Its totient is φ = 787840.

The previous prime is 2166629. The next prime is 2166673. The reversal of 2166670 is 766612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166673) 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, 9739 + ... + 9958.

It is an arithmetic number, because the mean of its divisors is an integer number (265923).

2^2166670 is an apocalyptic number.

2166670 is a deficient number, since it is larger than the sum of its proper divisors (2088098).

2166670 is a wasteful number, since it uses less digits than its factorization.

2166670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19715.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 2166670 is about 1471.9612766646. The cubic root of 2166670 is about 129.3990009693.

It can be divided in two parts, 21666 and 70, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 2166670 in words is "two million, one hundred sixty-six thousand, six hundred seventy".