990040637 has 2 divisors, whose sum is σ = 990040638. Its totient is φ = 990040636.

The previous prime is 990040631. The next prime is 990040651. The reversal of 990040637 is 736040099.

990040637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 755920036 + 234120601 = 27494^2 + 15301^2 .

It is a cyclic number.

It is not a de Polignac number, because 990040637 - 2²² = 985846333 is a prime.

It is a super-2 number, since 2×990040637² = 1960360925822731538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 990040637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990040631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495020318 + 495020319.

It is an arithmetic number, because the mean of its divisors is an integer number (495020319).

Almost surely, 2^990040637 is an apocalyptic number.

It is an amenable number.

990040637 is a deficient number, since it is larger than the sum of its proper divisors (1).

990040637 is an equidigital number, since it uses as much as digits as its factorization.

990040637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 990040637 is about 31464.9112027986. The cubic root of 990040637 is about 996.6691299564.

The spelling of 990040637 in words is "nine hundred ninety million, forty thousand, six hundred thirty-seven".