340521709 has 8 divisors (see below), whose sum is σ = 374549760. Its totient is φ = 309563980.

The previous prime is 340521707. The next prime is 340521733. The reversal of 340521709 is 907125043.

It is not a de Polignac number, because 340521709 - 2¹ = 340521707 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 (340521707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126589 + ... + 129250.

It is an arithmetic number, because the mean of its divisors is an integer number (46818720).

Almost surely, 2^340521709 is an apocalyptic number.

It is an amenable number.

340521709 is a deficient number, since it is larger than the sum of its proper divisors (34028051).

340521709 is an equidigital number, since it uses as much as digits as its factorization.

340521709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255872 (or 255850 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 340521709 is about 18453.2303134167. The cubic root of 340521709 is about 698.3100109486.

The spelling of 340521709 in words is "three hundred forty million, five hundred twenty-one thousand, seven hundred nine".