340235390209 has 27 divisors (see below), whose sum is σ = 405057450819. Its totient is φ = 285442219920.

The previous prime is 340235390207. The next prime is 340235390249. The reversal of 340235390209 is 902093532043.

The square root of 340235390209 is 583297.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 50330679025 + 289904711184 = 224345^2 + 538428^2 .

It is not a de Polignac number, because 340235390209 - 2¹ = 340235390207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340235390207) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 83409432 + ... + 83413510.

Almost surely, 2^340235390209 is an apocalyptic number.

340235390209 is the 583297-th square number.

340235390209 is the 291649-th centered octagonal number.

It is an amenable number.

340235390209 is a deficient number, since it is larger than the sum of its proper divisors (64822060610).

340235390209 is an frugal number, since it uses more digits than its factorization.

340235390209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8206 (or 4103 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 40.

The spelling of 340235390209 in words is "three hundred forty billion, two hundred thirty-five million, three hundred ninety thousand, two hundred nine".