1666707 has 8 divisors (see below), whose sum is σ = 2539776. Its totient is φ = 952392.

The previous prime is 1666657. The next prime is 1666711. The reversal of 1666707 is 7076661.

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

It is not a de Polignac number, because 1666707 - 2¹² = 1662611 is a prime.

1666707 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1666727) 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, 39663 + ... + 39704.

It is an arithmetic number, because the mean of its divisors is an integer number (317472).

2^1666707 is an apocalyptic number.

1666707 is a deficient number, since it is larger than the sum of its proper divisors (873069).

1666707 is an equidigital number, since it uses as much as digits as its factorization.

1666707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79377.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 1666707 is about 1291.0100696741. The cubic root of 1666707 is about 118.5640665510.

The spelling of 1666707 in words is "one million, six hundred sixty-six thousand, seven hundred seven".