340030391 has 2 divisors, whose sum is σ = 340030392. Its totient is φ = 340030390.

The previous prime is 340030387. The next prime is 340030399. The reversal of 340030391 is 193030043.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 340030391 - 2² = 340030387 is a prime.

It is a super-2 number, since 2×340030391² = 231241333607225762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340030399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170015195 + 170015196.

It is an arithmetic number, because the mean of its divisors is an integer number (170015196).

Almost surely, 2^340030391 is an apocalyptic number.

340030391 is a deficient number, since it is larger than the sum of its proper divisors (1).

340030391 is an equidigital number, since it uses as much as digits as its factorization.

340030391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 340030391 is about 18439.9129878641. The cubic root of 340030391 is about 697.9739996555.

The spelling of 340030391 in words is "three hundred forty million, thirty thousand, three hundred ninety-one".