9890338643 has 4 divisors (see below), whose sum is σ = 10025822808. Its totient is φ = 9754854480.

The previous prime is 9890338621. The next prime is 9890338649. The reversal of 9890338643 is 3468330989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3468330989 = 59 ⋅58785271.

It is a cyclic number.

It is not a de Polignac number, because 9890338643 - 2¹⁸ = 9890076499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9890338649) 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, 67741973 + ... + 67742118.

It is an arithmetic number, because the mean of its divisors is an integer number (2506455702).

Almost surely, 2^9890338643 is an apocalyptic number.

9890338643 is a deficient number, since it is larger than the sum of its proper divisors (135484165).

9890338643 is a wasteful number, since it uses less digits than its factorization.

9890338643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135484164.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The square root of 9890338643 is about 99450.1817142633. The cubic root of 9890338643 is about 2146.5304518613.

The spelling of 9890338643 in words is "nine billion, eight hundred ninety million, three hundred thirty-eight thousand, six hundred forty-three".