990641 has 8 divisors (see below), whose sum is σ = 1104480. Its totient is φ = 883008.

The previous prime is 990637. The next prime is 990643. The reversal of 990641 is 146099.

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

It is a cyclic number.

It is not a de Polignac number, because 990641 - 2² = 990637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990643) 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, 1211 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (138060).

2⁹⁹⁰⁶⁴¹ is an apocalyptic number.

It is an amenable number.

990641 is a deficient number, since it is larger than the sum of its proper divisors (113839).

990641 is a wasteful number, since it uses less digits than its factorization.

990641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 990641 is about 995.3094996030. The cubic root of 990641 is about 99.6870550093.

The spelling of 990641 in words is "nine hundred ninety thousand, six hundred forty-one".