2166403 has 2 divisors, whose sum is σ = 2166404. Its totient is φ = 2166402.

The previous prime is 2166319. The next prime is 2166407. The reversal of 2166403 is 3046612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2166403 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083201 + 1083202.

It is an arithmetic number, because the mean of its divisors is an integer number (1083202).

2^2166403 is an apocalyptic number.

2166403 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166403 is an equidigital number, since it uses as much as digits as its factorization.

2166403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 2166403 is about 1471.8705785496. The cubic root of 2166403 is about 129.3936854463.

The spelling of 2166403 in words is "two million, one hundred sixty-six thousand, four hundred three".