340005661 has 32 divisors (see below), whose sum is σ = 384072192. Its totient is φ = 299581440.

The previous prime is 340005607. The next prime is 340005671. The reversal of 340005661 is 166500043.

It is a cyclic number.

It is not a de Polignac number, because 340005661 - 2²³ = 331617053 is a prime.

It is a Duffinian number.

340005661 is a modest number, since divided by 5661 gives 340 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340005671) 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 31 ways as a sum of consecutive naturals, for example, 3177570 + ... + 3177676.

It is an arithmetic number, because the mean of its divisors is an integer number (12002256).

Almost surely, 2^340005661 is an apocalyptic number.

It is an amenable number.

340005661 is a deficient number, since it is larger than the sum of its proper divisors (44066531).

340005661 is a wasteful number, since it uses less digits than its factorization.

340005661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 340005661 is about 18439.2424193620. The cubic root of 340005661 is about 697.9570783097.

The spelling of 340005661 in words is "three hundred forty million, five thousand, six hundred sixty-one".