990826 has 4 divisors (see below), whose sum is σ = 1486242. Its totient is φ = 495412.

The previous prime is 990809. The next prime is 990841. The reversal of 990826 is 628099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 628099 = 17 ⋅36947.

It can be written as a sum of positive squares in only one way, i.e., 632025 + 358801 = 795^2 + 599^2 .

It is a junction number, because it is equal to n+sod(n) for n = 990791 and 990800.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247705 + ... + 247708.

2⁹⁹⁰⁸²⁶ is an apocalyptic number.

990826 is a deficient number, since it is larger than the sum of its proper divisors (495416).

990826 is a wasteful number, since it uses less digits than its factorization.

990826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495415.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 990826 is about 995.4024311805. The cubic root of 990826 is about 99.6932600682.

The spelling of 990826 in words is "nine hundred ninety thousand, eight hundred twenty-six".