1666395 has 24 divisors (see below), whose sum is σ = 3042000. Its totient is φ = 841536.

The previous prime is 1666393. The next prime is 1666397. The reversal of 1666395 is 5936661.

It is an interprime number because it is at equal distance from previous prime (1666393) and next prime (1666397).

It is not a de Polignac number, because 1666395 - 2¹ = 1666393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120 + ... + 1829.

It is an arithmetic number, because the mean of its divisors is an integer number (126750).

2^1666395 is an apocalyptic number.

1666395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666395 is a deficient number, since it is larger than the sum of its proper divisors (1375605).

1666395 is a wasteful number, since it uses less digits than its factorization.

1666395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979 (or 1976 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 1666395 is about 1290.8892284003. The cubic root of 1666395 is about 118.5566678706.

It can be divided in two parts, 166 and 6395, that added together give a 8-th power (6561 = 3⁸).

The spelling of 1666395 in words is "one million, six hundred sixty-six thousand, three hundred ninety-five".