1340671509 has 6 divisors (see below), whose sum is σ = 1936525526. Its totient is φ = 893781000.

The previous prime is 1340671489. The next prime is 1340671523. The reversal of 1340671509 is 9051760431.

It can be written as a sum of positive squares in only one way, i.e., 1280065284 + 60606225 = 35778^2 + 7785^2 .

It is not a de Polignac number, because 1340671509 - 2⁸ = 1340671253 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 (1340671589) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74481742 + ... + 74481759.

Almost surely, 2^1340671509 is an apocalyptic number.

It is an amenable number.

1340671509 is a deficient number, since it is larger than the sum of its proper divisors (595854017).

1340671509 is a wasteful number, since it uses less digits than its factorization.

1340671509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148963507 (or 148963504 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 1340671509 is about 36615.1814006158. The cubic root of 1340671509 is about 1102.6579001635.

The spelling of 1340671509 in words is "one billion, three hundred forty million, six hundred seventy-one thousand, five hundred nine".