134640209 has 6 divisors (see below), whose sum is σ = 147993090. Its totient is φ = 122400080.

The previous prime is 134640197. The next prime is 134640263. The reversal of 134640209 is 902046431.

It can be written as a sum of positive squares in only one way, i.e., 110355025 + 24285184 = 10505^2 + 4928^2 .

It is a de Polignac number, because none of the positive numbers 2^k-134640209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (134640109) 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, 556244 + ... + 556485.

It is an arithmetic number, because the mean of its divisors is an integer number (24665515).

Almost surely, 2^134640209 is an apocalyptic number.

It is an amenable number.

134640209 is a deficient number, since it is larger than the sum of its proper divisors (13352881).

134640209 is a wasteful number, since it uses less digits than its factorization.

134640209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112751 (or 1112740 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 134640209 is about 11603.4567694287. The cubic root of 134640209 is about 512.5366496892.

The spelling of 134640209 in words is "one hundred thirty-four million, six hundred forty thousand, two hundred nine".