1990927 has 2 divisors, whose sum is σ = 1990928. Its totient is φ = 1990926.

The previous prime is 1990907. The next prime is 1990939. The reversal of 1990927 is 7290991.

It is a strong prime.

It is an emirp because it is prime and its reverse (7290991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1990927 - 2¹⁹ = 1466639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990907) 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 as a sum of consecutive naturals, namely, 995463 + 995464.

It is an arithmetic number, because the mean of its divisors is an integer number (995464).

2^1990927 is an apocalyptic number.

1990927 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990927 is an equidigital number, since it uses as much as digits as its factorization.

1990927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 1990927 is about 1411.0021261501. The cubic root of 1990927 is about 125.8012951002.

The spelling of 1990927 in words is "one million, nine hundred ninety thousand, nine hundred twenty-seven".