340439431 has 2 divisors, whose sum is σ = 340439432. Its totient is φ = 340439430.

The previous prime is 340439423. The next prime is 340439447. The reversal of 340439431 is 134934043.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 340439431 - 2³ = 340439423 is a prime.

It is a super-2 number, since 2×340439431² = 231798012359207522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 340439393 and 340439402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340431431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170219715 + 170219716.

It is an arithmetic number, because the mean of its divisors is an integer number (170219716).

Almost surely, 2^340439431 is an apocalyptic number.

340439431 is a deficient number, since it is larger than the sum of its proper divisors (1).

340439431 is an equidigital number, since it uses as much as digits as its factorization.

340439431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 340439431 is about 18451.0008129640. Note that the first 3 decimals coincide. The cubic root of 340439431 is about 698.2537637474.

The spelling of 340439431 in words is "three hundred forty million, four hundred thirty-nine thousand, four hundred thirty-one".