1404840991 has 2 divisors, whose sum is σ = 1404840992. Its totient is φ = 1404840990.

The previous prime is 1404840979. The next prime is 1404841013. The reversal of 1404840991 is 1990484041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1404840991 - 2⁵ = 1404840959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1404840191) 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, 702420495 + 702420496.

It is an arithmetic number, because the mean of its divisors is an integer number (702420496).

Almost surely, 2^1404840991 is an apocalyptic number.

1404840991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1404840991 is an equidigital number, since it uses as much as digits as its factorization.

1404840991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1404840991 is about 37481.2085050629. The cubic root of 1404840991 is about 1119.9768785086.

The spelling of 1404840991 in words is "one billion, four hundred four million, eight hundred forty thousand, nine hundred ninety-one".