1975666 has 16 divisors (see below), whose sum is σ = 3695040. Its totient is φ = 769680.

The previous prime is 1975663. The next prime is 1975669. The reversal of 1975666 is 6665791.

It is an interprime number because it is at equal distance from previous prime (1975663) and next prime (1975669).

It is a super-2 number, since 2×1975666² = 7806512287112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1975663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6261 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (230940).

2^1975666 is an apocalyptic number.

1975666 is a deficient number, since it is larger than the sum of its proper divisors (1719374).

1975666 is a wasteful number, since it uses less digits than its factorization.

1975666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12849.

The product of its digits is 68040, while the sum is 40.

The square root of 1975666 is about 1405.5838644492. The cubic root of 1975666 is about 125.4790365137.

The spelling of 1975666 in words is "one million, nine hundred seventy-five thousand, six hundred sixty-six".