1791400397 has 2 divisors, whose sum is σ = 1791400398. Its totient is φ = 1791400396.

The previous prime is 1791400393. The next prime is 1791400417. The reversal of 1791400397 is 7930041971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1173679081 + 617721316 = 34259^2 + 24854^2 .

It is a cyclic number.

It is not a de Polignac number, because 1791400397 - 2² = 1791400393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1791400393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895700198 + 895700199.

It is an arithmetic number, because the mean of its divisors is an integer number (895700199).

Almost surely, 2^1791400397 is an apocalyptic number.

It is an amenable number.

1791400397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791400397 is an equidigital number, since it uses as much as digits as its factorization.

1791400397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 1791400397 is about 42324.9382397659. The cubic root of 1791400397 is about 1214.5001013270.

The spelling of 1791400397 in words is "one billion, seven hundred ninety-one million, four hundred thousand, three hundred ninety-seven".