1990841609 has 8 divisors (see below), whose sum is σ = 1999787520. Its totient is φ = 1981908000.

The previous prime is 1990841599. The next prime is 1990841639. The reversal of 1990841609 is 9061480991.

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 1990841609 - 2⁸ = 1990841353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990841639) 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, 486032 + ... + 490110.

It is an arithmetic number, because the mean of its divisors is an integer number (249973440).

Almost surely, 2^1990841609 is an apocalyptic number.

It is an amenable number.

1990841609 is a deficient number, since it is larger than the sum of its proper divisors (8945911).

1990841609 is a wasteful number, since it uses less digits than its factorization.

1990841609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6151.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 1990841609 is about 44618.8481361857. The cubic root of 1990841609 is about 1257.9949653230.

The spelling of 1990841609 in words is "one billion, nine hundred ninety million, eight hundred forty-one thousand, six hundred nine".