10646391 has 16 divisors (see below), whose sum is σ = 16491008. Its totient is φ = 5983200.

The previous prime is 10646387. The next prime is 10646431. The reversal of 10646391 is 19364601.

It is not a de Polignac number, because 10646391 - 2² = 10646387 is a prime.

It is a super-2 number, since 2×10646391² = 226691282649762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10646341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2875 + ... + 5436.

It is an arithmetic number, because the mean of its divisors is an integer number (1030688).

Almost surely, 2^10646391 is an apocalyptic number.

10646391 is a deficient number, since it is larger than the sum of its proper divisors (5844617).

10646391 is an equidigital number, since it uses as much as digits as its factorization.

10646391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8382.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 10646391 is about 3262.8807823762. The cubic root of 10646391 is about 219.9889181746.

The spelling of 10646391 in words is "ten million, six hundred forty-six thousand, three hundred ninety-one".