1038691 has 2 divisors, whose sum is σ = 1038692. Its totient is φ = 1038690.

The previous prime is 1038689. The next prime is 1038707. The reversal of 1038691 is 1968301.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1968301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1038691 - 2¹ = 1038689 is a prime.

Together with 1038689, it forms a pair of twin primes.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (1038601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519345 + 519346.

It is an arithmetic number, because the mean of its divisors is an integer number (519346).

2^1038691 is an apocalyptic number.

1038691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1038691 is an equidigital number, since it uses as much as digits as its factorization.

1038691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1038691 is about 1019.1619105912. The cubic root of 1038691 is about 101.2734153029.

The spelling of 1038691 in words is "one million, thirty-eight thousand, six hundred ninety-one".