990629 has 4 divisors (see below), whose sum is σ = 992940. Its totient is φ = 988320.

The previous prime is 990599. The next prime is 990631. The reversal of 990629 is 926099.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49729 + 940900 = 223^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 990629 - 2¹² = 986533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302 + ... + 1439.

It is an arithmetic number, because the mean of its divisors is an integer number (248235).

2⁹⁹⁰⁶²⁹ is an apocalyptic number.

It is an amenable number.

990629 is a deficient number, since it is larger than the sum of its proper divisors (2311).

990629 is a wasteful number, since it uses less digits than its factorization.

990629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 990629 is about 995.3034713091. The cubic root of 990629 is about 99.6866524923.

The spelling of 990629 in words is "nine hundred ninety thousand, six hundred twenty-nine".