1408991 has 2 divisors, whose sum is σ = 1408992. Its totient is φ = 1408990.

The previous prime is 1408987. The next prime is 1408993. The reversal of 1408991 is 1998041.

It is a strong prime.

It is an emirp because it is prime and its reverse (1998041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1408991 - 2² = 1408987 is a prime.

Together with 1408993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1408993) 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, 704495 + 704496.

It is an arithmetic number, because the mean of its divisors is an integer number (704496).

2^1408991 is an apocalyptic number.

1408991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1408991 is an equidigital number, since it uses as much as digits as its factorization.

1408991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1408991 is about 1187.0092670236. The cubic root of 1408991 is about 112.1078627125.

The spelling of 1408991 in words is "one million, four hundred eight thousand, nine hundred ninety-one".