1408338991 has 2 divisors, whose sum is σ = 1408338992. Its totient is φ = 1408338990.

The previous prime is 1408338989. The next prime is 1408339019. The reversal of 1408338991 is 1998338041.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1408338991 - 2¹ = 1408338989 is a prime.

Together with 1408338989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1408338901) 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, 704169495 + 704169496.

It is an arithmetic number, because the mean of its divisors is an integer number (704169496).

Almost surely, 2^1408338991 is an apocalyptic number.

1408338991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1408338991 is an equidigital number, since it uses as much as digits as its factorization.

1408338991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1408338991 is about 37527.8428769893. The cubic root of 1408338991 is about 1120.9056744870.

The spelling of 1408338991 in words is "one billion, four hundred eight million, three hundred thirty-eight thousand, nine hundred ninety-one".