1966665 has 8 divisors (see below), whose sum is σ = 3146688. Its totient is φ = 1048880.

The previous prime is 1966663. The next prime is 1966667. The reversal of 1966665 is 5666691.

It is an interprime number because it is at equal distance from previous prime (1966663) and next prime (1966667).

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

It is not a de Polignac number, because 1966665 - 2¹ = 1966663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966663) 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, 65541 + ... + 65570.

It is an arithmetic number, because the mean of its divisors is an integer number (393336).

2^1966665 is an apocalyptic number.

1966665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1966665 is a deficient number, since it is larger than the sum of its proper divisors (1180023).

1966665 is a wasteful number, since it uses less digits than its factorization.

1966665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131119.

The product of its digits is 58320, while the sum is 39.

The square root of 1966665 is about 1402.3783369690. The cubic root of 1966665 is about 125.2881884023.

The spelling of 1966665 in words is "one million, nine hundred sixty-six thousand, six hundred sixty-five".