1406389 has 2 divisors, whose sum is σ = 1406390. Its totient is φ = 1406388.

The previous prime is 1406387. The next prime is 1406417. The reversal of 1406389 is 9836041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1034289 + 372100 = 1017^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1406389 - 2¹ = 1406387 is a prime.

Together with 1406387, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1406389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1406387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703194 + 703195.

It is an arithmetic number, because the mean of its divisors is an integer number (703195).

2^1406389 is an apocalyptic number.

It is an amenable number.

1406389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406389 is an equidigital number, since it uses as much as digits as its factorization.

1406389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1406389 is about 1185.9127286609. The cubic root of 1406389 is about 112.0388098920.

The spelling of 1406389 in words is "one million, four hundred six thousand, three hundred eighty-nine".