1666041 has 8 divisors (see below), whose sum is σ = 2392320. Its totient is φ = 1025232.

The previous prime is 1666039. The next prime is 1666043. The reversal of 1666041 is 1406661.

It is an interprime number because it is at equal distance from previous prime (1666039) and next prime (1666043).

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

It is not a de Polignac number, because 1666041 - 2¹ = 1666039 is a prime.

It is a super-2 number, since 2×1666041² = 5551385227362, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666043) 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, 21321 + ... + 21398.

It is an arithmetic number, because the mean of its divisors is an integer number (299040).

2^1666041 is an apocalyptic number.

It is an amenable number.

1666041 is a deficient number, since it is larger than the sum of its proper divisors (726279).

1666041 is a wasteful number, since it uses less digits than its factorization.

1666041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42735.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1666041 is about 1290.7521063318. The cubic root of 1666041 is about 118.5482720956.

The spelling of 1666041 in words is "one million, six hundred sixty-six thousand, forty-one".