10643989 has 4 divisors (see below), whose sum is σ = 11270124. Its totient is φ = 10017856.

The previous prime is 10643981. The next prime is 10644001. The reversal of 10643989 is 98934601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98934601 = 757 ⋅130693.

It can be written as a sum of positive squares in 2 ways, for example, as 6543364 + 4100625 = 2558^2 + 2025^2 .

It is a cyclic number.

It is not a de Polignac number, because 10643989 - 2³ = 10643981 is a prime.

It is a super-2 number, since 2×10643989² = 226589003664242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10643981) 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, 313042 + ... + 313075.

It is an arithmetic number, because the mean of its divisors is an integer number (2817531).

Almost surely, 2^10643989 is an apocalyptic number.

It is an amenable number.

10643989 is a deficient number, since it is larger than the sum of its proper divisors (626135).

10643989 is an equidigital number, since it uses as much as digits as its factorization.

10643989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626134.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 10643989 is about 3262.5126819677. The cubic root of 10643989 is about 219.9723725638.

The spelling of 10643989 in words is "ten million, six hundred forty-three thousand, nine hundred eighty-nine".