1822391 has 2 divisors, whose sum is σ = 1822392. Its totient is φ = 1822390.

The previous prime is 1822367. The next prime is 1822393. The reversal of 1822391 is 1932281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1822391 is a prime.

It is a super-2 number, since 2×1822391² = 6642217913762, which contains 22 as substring.

Together with 1822393, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1822391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1822393) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911195 + 911196.

It is an arithmetic number, because the mean of its divisors is an integer number (911196).

2^1822391 is an apocalyptic number.

1822391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1822391 is an equidigital number, since it uses as much as digits as its factorization.

1822391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 1822391 is about 1349.9596290260. The cubic root of 1822391 is about 122.1463575417.

The spelling of 1822391 in words is "one million, eight hundred twenty-two thousand, three hundred ninety-one".