123540340342 has 4 divisors (see below), whose sum is σ = 185310510516. Its totient is φ = 61770170170.

The previous prime is 123540340283. The next prime is 123540340351. The reversal of 123540340342 is 243043045321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885085084 + ... + 30885085087.

It is an arithmetic number, because the mean of its divisors is an integer number (46327627629).

Almost surely, 2^123540340342 is an apocalyptic number.

123540340342 is a deficient number, since it is larger than the sum of its proper divisors (61770170174).

123540340342 is an equidigital number, since it uses as much as digits as its factorization.

123540340342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61770170173.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 123540340342 its reverse (243043045321), we get a palindrome (366583385663).

The spelling of 123540340342 in words is "one hundred twenty-three billion, five hundred forty million, three hundred forty thousand, three hundred forty-two".