1990771 has 8 divisors (see below), whose sum is σ = 2070464. Its totient is φ = 1912680.

The previous prime is 1990759. The next prime is 1990787. The reversal of 1990771 is 1770991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1990771 - 2⁷ = 1990643 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990171) 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, 2536 + ... + 3226.

It is an arithmetic number, because the mean of its divisors is an integer number (258808).

2^1990771 is an apocalyptic number.

1990771 is a deficient number, since it is larger than the sum of its proper divisors (79693).

1990771 is an equidigital number, since it uses as much as digits as its factorization.

1990771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801.

The product of its (nonzero) digits is 3969, while the sum is 34.

The square root of 1990771 is about 1410.9468452071. The cubic root of 1990771 is about 125.7980092749.

The spelling of 1990771 in words is "one million, nine hundred ninety thousand, seven hundred seventy-one".