1990332637 has 2 divisors, whose sum is σ = 1990332638. Its totient is φ = 1990332636.

The previous prime is 1990332607. The next prime is 1990332667. The reversal of 1990332637 is 7362330991.

It is a balanced prime because it is at equal distance from previous prime (1990332607) and next prime (1990332667).

It can be written as a sum of positive squares in only one way, i.e., 1742144121 + 248188516 = 41739^2 + 15754^2 .

It is an emirp because it is prime and its reverse (7362330991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990332637 is a prime.

It is a super-2 number, since 2×1990332637² = 7922848011814747538, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1990332593 and 1990332602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990332607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995166318 + 995166319.

It is an arithmetic number, because the mean of its divisors is an integer number (995166319).

Almost surely, 2^1990332637 is an apocalyptic number.

It is an amenable number.

1990332637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990332637 is an equidigital number, since it uses as much as digits as its factorization.

1990332637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 43.

The square root of 1990332637 is about 44613.1442178199. The cubic root of 1990332637 is about 1257.8877512378.

The spelling of 1990332637 in words is "one billion, nine hundred ninety million, three hundred thirty-two thousand, six hundred thirty-seven".