1930391 has 2 divisors, whose sum is σ = 1930392. Its totient is φ = 1930390.

The previous prime is 1930373. The next prime is 1930417.

1930391 is nontrivially palindromic in base 10.

It is an a-pointer prime, because the next prime (1930417) can be obtained adding 1930391 to its sum of digits (26).

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1930391 - 2¹⁴ = 1914007 is a prime.

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 1930391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1930301) 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, 965195 + 965196.

It is an arithmetic number, because the mean of its divisors is an integer number (965196).

2^1930391 is an apocalyptic number.

1930391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1930391 is an equidigital number, since it uses as much as digits as its factorization.

1930391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 1930391 is about 1389.3851157976. The cubic root of 1930391 is about 124.5131139985.

The spelling of 1930391 in words is "one million, nine hundred thirty thousand, three hundred ninety-one".