123240142 has 4 divisors (see below), whose sum is σ = 184860216. Its totient is φ = 61620070.

The previous prime is 123240127. The next prime is 123240179. The reversal of 123240142 is 241042321.

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 (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810034 + ... + 30810037.

It is an arithmetic number, because the mean of its divisors is an integer number (46215054).

Almost surely, 2^123240142 is an apocalyptic number.

123240142 is a deficient number, since it is larger than the sum of its proper divisors (61620074).

123240142 is an equidigital number, since it uses as much as digits as its factorization.

123240142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61620073.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 123240142 is about 11101.3576647183. The cubic root of 123240142 is about 497.6424238074.

Adding to 123240142 its reverse (241042321), we get a palindrome (364282463).

The spelling of 123240142 in words is "one hundred twenty-three million, two hundred forty thousand, one hundred forty-two".