1990487 has 2 divisors, whose sum is σ = 1990488. Its totient is φ = 1990486.

The previous prime is 1990481. The next prime is 1990493. The reversal of 1990487 is 7840991.

It is a balanced prime because it is at equal distance from previous prime (1990481) and next prime (1990493).

It is a cyclic number.

It is not a de Polignac number, because 1990487 - 2²⁰ = 941911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1990487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995243 + 995244.

It is an arithmetic number, because the mean of its divisors is an integer number (995244).

2^1990487 is an apocalyptic number.

1990487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990487 is an equidigital number, since it uses as much as digits as its factorization.

1990487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1990487 is about 1410.8461999807. The cubic root of 1990487 is about 125.7920269472.

It can be divided in two parts, 19904 and 87, that added together give a palindrome (19991).

The spelling of 1990487 in words is "one million, nine hundred ninety thousand, four hundred eighty-seven".