1995566 has 4 divisors (see below), whose sum is σ = 2993352. Its totient is φ = 997782.

The previous prime is 1995547. The next prime is 1995583. The reversal of 1995566 is 6655991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6655991 = 193 ⋅34487.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 498890 + ... + 498893.

It is an arithmetic number, because the mean of its divisors is an integer number (748338).

2^1995566 is an apocalyptic number.

1995566 is a deficient number, since it is larger than the sum of its proper divisors (997786).

1995566 is an equidigital number, since it uses as much as digits as its factorization.

1995566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997785.

The product of its digits is 72900, while the sum is 41.

The square root of 1995566 is about 1412.6450368015. The cubic root of 1995566 is about 125.8989279321.

The spelling of 1995566 in words is "one million, nine hundred ninety-five thousand, five hundred sixty-six".