2166407 has 2 divisors, whose sum is σ = 2166408. Its totient is φ = 2166406.

The previous prime is 2166403. The next prime is 2166419. The reversal of 2166407 is 7046612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166407 - 2² = 2166403 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083203 + 1083204.

It is an arithmetic number, because the mean of its divisors is an integer number (1083204).

2^2166407 is an apocalyptic number.

2166407 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166407 is an equidigital number, since it uses as much as digits as its factorization.

2166407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 2166407 is about 1471.8719373641. The cubic root of 2166407 is about 129.3937650829.

The spelling of 2166407 in words is "two million, one hundred sixty-six thousand, four hundred seven".