1026391 has 2 divisors, whose sum is σ = 1026392. Its totient is φ = 1026390.

The previous prime is 1026383. The next prime is 1026401. The reversal of 1026391 is 1936201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1026391 - 2³ = 1026383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1026331) 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, 513195 + 513196.

It is an arithmetic number, because the mean of its divisors is an integer number (513196).

2^1026391 is an apocalyptic number.

1026391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1026391 is an equidigital number, since it uses as much as digits as its factorization.

1026391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1026391 is about 1013.1095695925. The cubic root of 1026391 is about 100.8720727832.

The spelling of 1026391 in words is "one million, twenty-six thousand, three hundred ninety-one".