1379509 has 2 divisors, whose sum is σ = 1379510. Its totient is φ = 1379508.

The previous prime is 1379503. The next prime is 1379513. The reversal of 1379509 is 9059731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 10609 = 1170^2 + 103^2 .

It is an emirp because it is prime and its reverse (9059731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1379509 - 2⁹ = 1378997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1379503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689754 + 689755.

It is an arithmetic number, because the mean of its divisors is an integer number (689755).

2^1379509 is an apocalyptic number.

It is an amenable number.

1379509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1379509 is an equidigital number, since it uses as much as digits as its factorization.

1379509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 1379509 is about 1174.5250103765. The cubic root of 1379509 is about 111.3204225251.

The spelling of 1379509 in words is "one million, three hundred seventy-nine thousand, five hundred nine".