123442140 has 48 divisors (see below), whose sum is σ = 350808192. Its totient is φ = 32425536.

The previous prime is 123442139. The next prime is 123442153. The reversal of 123442140 is 41244321.

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 in 15 ways as a sum of consecutive naturals, for example, 11334 + ... + 19373.

It is an arithmetic number, because the mean of its divisors is an integer number (7308504).

Almost surely, 2^123442140 is an apocalyptic number.

123442140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123442140 is an abundant number, since it is smaller than the sum of its proper divisors (227366052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123442140 is a wasteful number, since it uses less digits than its factorization.

123442140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30786 (or 30784 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 123442140 is about 11110.4518359966. The cubic root of 123442140 is about 497.9141640096.

Adding to 123442140 its reverse (41244321), we get a palindrome (164686461).

The spelling of 123442140 in words is "one hundred twenty-three million, four hundred forty-two thousand, one hundred forty".