990434 has 8 divisors (see below), whose sum is σ = 1493328. Its totient is φ = 492660.

The previous prime is 990397. The next prime is 990463. The reversal of 990434 is 434099.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 990397 and 990406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752 + ... + 1595.

It is an arithmetic number, because the mean of its divisors is an integer number (186666).

2⁹⁹⁰⁴³⁴ is an apocalyptic number.

990434 is a deficient number, since it is larger than the sum of its proper divisors (502894).

990434 is a wasteful number, since it uses less digits than its factorization.

990434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 990434 is about 995.2055064156. The cubic root of 990434 is about 99.6801111356.

The spelling of 990434 in words is "nine hundred ninety thousand, four hundred thirty-four".