990430637 has 8 divisors (see below), whose sum is σ = 1132369536. Its totient is φ = 848603952.

The previous prime is 990430633. The next prime is 990430643. The reversal of 990430637 is 736034099.

990430637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 990430637 - 2² = 990430633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 990430594 and 990430603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990430633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8198 + ... + 45255.

It is an arithmetic number, because the mean of its divisors is an integer number (141546192).

Almost surely, 2^990430637 is an apocalyptic number.

It is an amenable number.

990430637 is a deficient number, since it is larger than the sum of its proper divisors (141938899).

990430637 is a wasteful number, since it uses less digits than its factorization.

990430637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56107.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 990430637 is about 31471.1079722338. The cubic root of 990430637 is about 996.7999831483.

The spelling of 990430637 in words is "nine hundred ninety million, four hundred thirty thousand, six hundred thirty-seven".