1427809 has 2 divisors, whose sum is σ = 1427810. Its totient is φ = 1427808.

The previous prime is 1427773. The next prime is 1427821. The reversal of 1427809 is 9087241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 944784 + 483025 = 972^2 + 695^2 .

It is an emirp because it is prime and its reverse (9087241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1427809 - 2⁷ = 1427681 is a prime.

It is not a weakly prime, because it can be changed into another prime (1427879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713904 + 713905.

It is an arithmetic number, because the mean of its divisors is an integer number (713905).

2^1427809 is an apocalyptic number.

It is an amenable number.

1427809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427809 is an equidigital number, since it uses as much as digits as its factorization.

1427809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1427809 is about 1194.9096200132. The cubic root of 1427809 is about 112.6047485291.

The spelling of 1427809 in words is "one million, four hundred twenty-seven thousand, eight hundred nine".