342400391 has 2 divisors, whose sum is σ = 342400392. Its totient is φ = 342400390.

The previous prime is 342400369. The next prime is 342400393. The reversal of 342400391 is 193004243.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 342400391 - 2²² = 338206087 is a prime.

Together with 342400393, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 342400391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342400393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171200195 + 171200196.

It is an arithmetic number, because the mean of its divisors is an integer number (171200196).

Almost surely, 2^342400391 is an apocalyptic number.

342400391 is a deficient number, since it is larger than the sum of its proper divisors (1).

342400391 is an equidigital number, since it uses as much as digits as its factorization.

342400391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 342400391 is about 18504.0641752022. The cubic root of 342400391 is about 699.5918648040.

The spelling of 342400391 in words is "three hundred forty-two million, four hundred thousand, three hundred ninety-one".