1456789 has 2 divisors, whose sum is σ = 1456790.
Its totient is φ = 1456788.
The previous prime is 1456759. The next prime is 1456799. The reversal of 1456789 is 9876541.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1034289 + 422500 = 1017^2 + 650^2
It is a cyclic number.
It is not a de Polignac number, because 1456789 - 215 = 1424021 is a prime.
It is an alternating number because its digits alternate between odd and even.
It is a plaindrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1456709) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 728394 + 728395.
It is an arithmetic number, because the mean of its divisors is an integer number (728395).
21456789 is an apocalyptic number.
It is an amenable number.
1456789 is a deficient number, since it is larger than the sum of its proper divisors (1).
1456789 is an equidigital number, since it uses as much as digits as its factorization.
1456789 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 60480, while the sum is 40.
The square root of 1456789 is about 1206.9751447317.
The cubic root of 1456789 is about 113.3614914655.
The spelling of 1456789 in words is "one million, four hundred fifty-six thousand, seven hundred eighty-nine".