340209731 has 2 divisors, whose sum is σ = 340209732. Its totient is φ = 340209730.

The previous prime is 340209707. The next prime is 340209739. The reversal of 340209731 is 137902043.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 340209731 - 2¹⁰ = 340208707 is a prime.

It is a super-2 number, since 2×340209731² = 231485322134184722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 340209694 and 340209703.

It is not a weakly prime, because it can be changed into another prime (340209739) 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 as a sum of consecutive naturals, namely, 170104865 + 170104866.

It is an arithmetic number, because the mean of its divisors is an integer number (170104866).

Almost surely, 2^340209731 is an apocalyptic number.

340209731 is a deficient number, since it is larger than the sum of its proper divisors (1).

340209731 is an equidigital number, since it uses as much as digits as its factorization.

340209731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 340209731 is about 18444.7751680523. The cubic root of 340209731 is about 698.0966873722.

The spelling of 340209731 in words is "three hundred forty million, two hundred nine thousand, seven hundred thirty-one".