1230391 has 2 divisors, whose sum is σ = 1230392. Its totient is φ = 1230390.

The previous prime is 1230379. The next prime is 1230401. The reversal of 1230391 is 1930321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1230391 - 2⁷ = 1230263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1230301) 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, 615195 + 615196.

It is an arithmetic number, because the mean of its divisors is an integer number (615196).

2^1230391 is an apocalyptic number.

1230391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230391 is an equidigital number, since it uses as much as digits as its factorization.

1230391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 1230391 is about 1109.2299130478. The cubic root of 1230391 is about 107.1554789786.

It can be divided in two parts, 12 and 30391, that added together give a palindrome (30403).

The spelling of 1230391 in words is "one million, two hundred thirty thousand, three hundred ninety-one".