1990777 has 4 divisors (see below), whose sum is σ = 1993600. Its totient is φ = 1987956.

The previous prime is 1990759. The next prime is 1990787. The reversal of 1990777 is 7770991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1990777 - 2¹¹ = 1988729 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990787) 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 3 ways as a sum of consecutive naturals, for example, 688 + ... + 2110.

It is an arithmetic number, because the mean of its divisors is an integer number (498400).

2^1990777 is an apocalyptic number.

It is an amenable number.

1990777 is a deficient number, since it is larger than the sum of its proper divisors (2823).

1990777 is a wasteful number, since it uses less digits than its factorization.

1990777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2822.

The product of its (nonzero) digits is 27783, while the sum is 40.

The square root of 1990777 is about 1410.9489714373. The cubic root of 1990777 is about 125.7981356560.

The spelling of 1990777 in words is "one million, nine hundred ninety thousand, seven hundred seventy-seven".