1990787 has 2 divisors, whose sum is σ = 1990788. Its totient is φ = 1990786.

The previous prime is 1990759. The next prime is 1990823. The reversal of 1990787 is 7870991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1990787 - 2¹⁴ = 1974403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1990187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995393 + 995394.

It is an arithmetic number, because the mean of its divisors is an integer number (995394).

2^1990787 is an apocalyptic number.

1990787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990787 is an equidigital number, since it uses as much as digits as its factorization.

1990787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 1990787 is about 1410.9525151471. The cubic root of 1990787 is about 125.7983462905.

The spelling of 1990787 in words is "one million, nine hundred ninety thousand, seven hundred eighty-seven".