340026391 has 2 divisors, whose sum is σ = 340026392. Its totient is φ = 340026390.

The previous prime is 340026377. The next prime is 340026403. The reversal of 340026391 is 193620043.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 340026391 - 2⁹ = 340025879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340026301) 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, 170013195 + 170013196.

It is an arithmetic number, because the mean of its divisors is an integer number (170013196).

Almost surely, 2^340026391 is an apocalyptic number.

340026391 is a deficient number, since it is larger than the sum of its proper divisors (1).

340026391 is an equidigital number, since it uses as much as digits as its factorization.

340026391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 340026391 is about 18439.8045271635. The cubic root of 340026391 is about 697.9712627364.

It can be divided in two parts, 3400 and 26391, that added together give a cube (29791 = 31³).

The spelling of 340026391 in words is "three hundred forty million, twenty-six thousand, three hundred ninety-one".