2166378 has 32 divisors (see below), whose sum is σ = 4670784. Its totient is φ = 667392.

The previous prime is 2166319. The next prime is 2166403. The reversal of 2166378 is 8736612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6676 + ... + 6992.

It is an arithmetic number, because the mean of its divisors is an integer number (145962).

2^2166378 is an apocalyptic number.

2166378 is an abundant number, since it is smaller than the sum of its proper divisors (2504406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166378 is a wasteful number, since it uses less digits than its factorization.

2166378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406.

The product of its digits is 12096, while the sum is 33.

The square root of 2166378 is about 1471.8620859306. The cubic root of 2166378 is about 129.3931877158.

The spelling of 2166378 in words is "two million, one hundred sixty-six thousand, three hundred seventy-eight".