1375509 has 16 divisors (see below), whose sum is σ = 1923264. Its totient is φ = 873600.

The previous prime is 1375481. The next prime is 1375513. The reversal of 1375509 is 9055731.

It is a happy number.

It is not a de Polignac number, because 1375509 - 2¹⁵ = 1342741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1375109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6414 + ... + 6624.

It is an arithmetic number, because the mean of its divisors is an integer number (120204).

2^1375509 is an apocalyptic number.

It is an amenable number.

1375509 is a deficient number, since it is larger than the sum of its proper divisors (547755).

1375509 is a wasteful number, since it uses less digits than its factorization.

1375509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308.

The product of its (nonzero) digits is 4725, while the sum is 30.

The square root of 1375509 is about 1172.8209582029. The cubic root of 1375509 is about 111.2127241189.

The spelling of 1375509 in words is "one million, three hundred seventy-five thousand, five hundred nine".