1409509 has 4 divisors (see below), whose sum is σ = 1470816. Its totient is φ = 1348204.

The previous prime is 1409503. The next prime is 1409519. The reversal of 1409509 is 9059041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9059041 = 1039 ⋅8719.

It is a cyclic number.

It is not a de Polignac number, because 1409509 - 2⁷ = 1409381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1409503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30619 + ... + 30664.

It is an arithmetic number, because the mean of its divisors is an integer number (367704).

2^1409509 is an apocalyptic number.

It is an amenable number.

1409509 is a deficient number, since it is larger than the sum of its proper divisors (61307).

1409509 is an equidigital number, since it uses as much as digits as its factorization.

1409509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61306.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1409509 is about 1187.2274424052. The cubic root of 1409509 is about 112.1215994357.

The spelling of 1409509 in words is "one million, four hundred nine thousand, five hundred nine".