138420343 has 2 divisors, whose sum is σ = 138420344. Its totient is φ = 138420342.

The previous prime is 138420329. The next prime is 138420353. The reversal of 138420343 is 343024831.

It is a strong prime.

It is an emirp because it is prime and its reverse (343024831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138420343 - 2²¹ = 136323191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138420323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69210171 + 69210172.

It is an arithmetic number, because the mean of its divisors is an integer number (69210172).

Almost surely, 2^138420343 is an apocalyptic number.

138420343 is a deficient number, since it is larger than the sum of its proper divisors (1).

138420343 is an equidigital number, since it uses as much as digits as its factorization.

138420343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 138420343 is about 11765.2175075517. The cubic root of 138420343 is about 517.2890758278.

The spelling of 138420343 in words is "one hundred thirty-eight million, four hundred twenty thousand, three hundred forty-three".