10638643 has 4 divisors (see below), whose sum is σ = 10715320. Its totient is φ = 10561968.

The previous prime is 10638631. The next prime is 10638697. The reversal of 10638643 is 34683601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10638643 is a prime.

It is a super-2 number, since 2×10638643² = 226361449762898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10636643) by changing a digit.

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, 38130 + ... + 38407.

It is an arithmetic number, because the mean of its divisors is an integer number (2678830).

Almost surely, 2^10638643 is an apocalyptic number.

10638643 is a deficient number, since it is larger than the sum of its proper divisors (76677).

10638643 is an equidigital number, since it uses as much as digits as its factorization.

10638643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76676.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 10638643 is about 3261.6932719065. The cubic root of 10638643 is about 219.9355389657.

The spelling of 10638643 in words is "ten million, six hundred thirty-eight thousand, six hundred forty-three".