1406666 has 8 divisors (see below), whose sum is σ = 2167140. Its totient is φ = 684288.

The previous prime is 1406651. The next prime is 1406677. The reversal of 1406666 is 6666041.

It can be written as a sum of positive squares in 2 ways, for example, as 1177225 + 229441 = 1085^2 + 479^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

1406666 is a modest number, since divided by 6666 gives 140 as remainder.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9431 + ... + 9578.

2^1406666 is an apocalyptic number.

1406666 is a deficient number, since it is larger than the sum of its proper divisors (760474).

1406666 is a wasteful number, since it uses less digits than its factorization.

1406666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19048.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1406666 is about 1186.0295105941. The cubic root of 1406666 is about 112.0461650673.

It can be divided in two parts, 1406 and 666, that multiplied together give a triangular number (936396 = T₁₃₆₈).

The spelling of 1406666 in words is "one million, four hundred six thousand, six hundred sixty-six".