340342403 has 2 divisors, whose sum is σ = 340342404. Its totient is φ = 340342402.

The previous prime is 340342333. The next prime is 340342417. The reversal of 340342403 is 304243043.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 340342403 - 2⁸ = 340342147 is a prime.

It is not a weakly prime, because it can be changed into another prime (340345403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170171201 + 170171202.

It is an arithmetic number, because the mean of its divisors is an integer number (170171202).

Almost surely, 2^340342403 is an apocalyptic number.

340342403 is a deficient number, since it is larger than the sum of its proper divisors (1).

340342403 is an equidigital number, since it uses as much as digits as its factorization.

340342403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 23.

The square root of 340342403 is about 18448.3712831242. The cubic root of 340342403 is about 698.1874214483.

Adding to 340342403 its reverse (304243043), we get a palindrome (644585446).

The spelling of 340342403 in words is "three hundred forty million, three hundred forty-two thousand, four hundred three".