990487 has 2 divisors, whose sum is σ = 990488. Its totient is φ = 990486.

The previous prime is 990469. The next prime is 990497. The reversal of 990487 is 784099.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990487 - 2⁷ = 990359 is a prime.

990487 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495243 + 495244.

It is an arithmetic number, because the mean of its divisors is an integer number (495244).

2⁹⁹⁰⁴⁸⁷ is an apocalyptic number.

990487 is a deficient number, since it is larger than the sum of its proper divisors (1).

990487 is an equidigital number, since it uses as much as digits as its factorization.

990487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 990487 is about 995.2321337256. The cubic root of 990487 is about 99.6818891278.

The spelling of 990487 in words is "nine hundred ninety thousand, four hundred eighty-seven".