1406591 has 2 divisors, whose sum is σ = 1406592. Its totient is φ = 1406590.

The previous prime is 1406557. The next prime is 1406593. The reversal of 1406591 is 1956041.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1406591 is a prime.

It is a Sophie Germain prime.

Together with 1406593, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 1406591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1406593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703295 + 703296.

It is an arithmetic number, because the mean of its divisors is an integer number (703296).

2^1406591 is an apocalyptic number.

1406591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406591 is an equidigital number, since it uses as much as digits as its factorization.

1406591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1406591 is about 1185.9978920723. The cubic root of 1406591 is about 112.0441736892.

The spelling of 1406591 in words is "one million, four hundred six thousand, five hundred ninety-one".