990637 has 2 divisors, whose sum is σ = 990638. Its totient is φ = 990636.

The previous prime is 990631. The next prime is 990643. The reversal of 990637 is 736099.

It is a balanced prime because it is at equal distance from previous prime (990631) and next prime (990643).

It can be written as a sum of positive squares in only one way, i.e., 988036 + 2601 = 994^2 + 51^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990637 is a prime.

990637 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495318 + 495319.

It is an arithmetic number, because the mean of its divisors is an integer number (495319).

2⁹⁹⁰⁶³⁷ is an apocalyptic number.

It is an amenable number.

990637 is a deficient number, since it is larger than the sum of its proper divisors (1).

990637 is an equidigital number, since it uses as much as digits as its factorization.

990637 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 34.

The square root of 990637 is about 995.3074901758. The cubic root of 990637 is about 99.6869208373.

The spelling of 990637 in words is "nine hundred ninety thousand, six hundred thirty-seven".