1390391 has 2 divisors, whose sum is σ = 1390392. Its totient is φ = 1390390.

The previous prime is 1390387. The next prime is 1390399. The reversal of 1390391 is 1930931.

It is a weak prime.

It is an emirp because it is prime and its reverse (1930931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1390391 - 2² = 1390387 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1390391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390399) 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, 695195 + 695196.

It is an arithmetic number, because the mean of its divisors is an integer number (695196).

2^1390391 is an apocalyptic number.

1390391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390391 is an equidigital number, since it uses as much as digits as its factorization.

1390391 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 1390391 is about 1179.1484215314. The cubic root of 1390391 is about 111.6123663622.

The spelling of 1390391 in words is "one million, three hundred ninety thousand, three hundred ninety-one".