340165721 has 16 divisors (see below), whose sum is σ = 410511360. Its totient is φ = 275354640.

The previous prime is 340165691. The next prime is 340165723. The reversal of 340165721 is 127561043.

It is a cyclic number.

It is not a de Polignac number, because 340165721 - 2²² = 335971417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (340165723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40160 + ... + 47886.

It is an arithmetic number, because the mean of its divisors is an integer number (25656960).

Almost surely, 2^340165721 is an apocalyptic number.

It is an amenable number.

340165721 is a deficient number, since it is larger than the sum of its proper divisors (70345639).

340165721 is a wasteful number, since it uses less digits than its factorization.

340165721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8084.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 340165721 is about 18443.5821086903. The cubic root of 340165721 is about 698.0665838240.

The spelling of 340165721 in words is "three hundred forty million, one hundred sixty-five thousand, seven hundred twenty-one".