1966406 has 16 divisors (see below), whose sum is σ = 3238704. Its totient is φ = 889824.

The previous prime is 1966399. The next prime is 1966409. The reversal of 1966406 is 6046691.

It is a d-powerful number, because it can be written as 1 + 9⁴ + 6² + 6⁷ + 4⁴ + 0 + 6⁸ .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966409) 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, 665 + ... + 2091.

It is an arithmetic number, because the mean of its divisors is an integer number (202419).

2^1966406 is an apocalyptic number.

1966406 is a deficient number, since it is larger than the sum of its proper divisors (1272298).

1966406 is a wasteful number, since it uses less digits than its factorization.

1966406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1966406 is about 1402.2859908022. The cubic root of 1966406 is about 125.2826882170.

The spelling of 1966406 in words is "one million, nine hundred sixty-six thousand, four hundred six".