340259921 has 2 divisors, whose sum is σ = 340259922. Its totient is φ = 340259920.

The previous prime is 340259917. The next prime is 340259939. The reversal of 340259921 is 129952043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318122896 + 22137025 = 17836^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 340259921 - 2² = 340259917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (340259971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170129960 + 170129961.

It is an arithmetic number, because the mean of its divisors is an integer number (170129961).

Almost surely, 2^340259921 is an apocalyptic number.

It is an amenable number.

340259921 is a deficient number, since it is larger than the sum of its proper divisors (1).

340259921 is an equidigital number, since it uses as much as digits as its factorization.

340259921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 340259921 is about 18446.1356657702. The cubic root of 340259921 is about 698.1310149714.

The spelling of 340259921 in words is "three hundred forty million, two hundred fifty-nine thousand, nine hundred twenty-one".