10638391 has 2 divisors, whose sum is σ = 10638392. Its totient is φ = 10638390.

The previous prime is 10638371. The next prime is 10638421. The reversal of 10638391 is 19383601.

It is a weak prime.

It is an emirp because it is prime and its reverse (19383601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10638391 - 2⁷ = 10638263 is a prime.

It is a super-2 number, since 2×10638391² = 226350726137762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10638371) 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 as a sum of consecutive naturals, namely, 5319195 + 5319196.

It is an arithmetic number, because the mean of its divisors is an integer number (5319196).

Almost surely, 2^10638391 is an apocalyptic number.

10638391 is a deficient number, since it is larger than the sum of its proper divisors (1).

10638391 is an equidigital number, since it uses as much as digits as its factorization.

10638391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 10638391 is about 3261.6546414358. The cubic root of 10638391 is about 219.9338023973.

It can be divided in two parts, 10 and 638391, that added together give a square (638401 = 799²).

The spelling of 10638391 in words is "ten million, six hundred thirty-eight thousand, three hundred ninety-one".