1478809 has 2 divisors, whose sum is σ = 1478810. Its totient is φ = 1478808.

The previous prime is 1478777. The next prime is 1478837. The reversal of 1478809 is 9088741.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1440000 + 38809 = 1200^2 + 197^2 .

It is an emirp because it is prime and its reverse (9088741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1478809 - 2⁵ = 1478777 is a prime.

1478809 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1478839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 739404 + 739405.

It is an arithmetic number, because the mean of its divisors is an integer number (739405).

2^1478809 is an apocalyptic number.

It is an amenable number.

1478809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1478809 is an equidigital number, since it uses as much as digits as its factorization.

1478809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1478809 is about 1216.0629095569. The cubic root of 1478809 is about 113.9298069994.

The spelling of 1478809 in words is "one million, four hundred seventy-eight thousand, eight hundred nine".