123143140 has 24 divisors (see below), whose sum is σ = 262842552. Its totient is φ = 48449280.

The previous prime is 123143113. The next prime is 123143143. The reversal of 123143140 is 41341321.

It can be written as a sum of positive squares in 4 ways, for example, as 5116644 + 118026496 = 2262^2 + 10864^2 .

It is not an unprimeable number, because it can be changed into a prime (123143143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49249 + ... + 51688.

It is an arithmetic number, because the mean of its divisors is an integer number (10951773).

Almost surely, 2^123143140 is an apocalyptic number.

123143140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123143140 is an abundant number, since it is smaller than the sum of its proper divisors (139699412).

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

123143140 is a wasteful number, since it uses less digits than its factorization.

123143140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101007 (or 101005 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 123143140 is about 11096.9878796005. The cubic root of 123143140 is about 497.5118251779.

Adding to 123143140 its reverse (41341321), we get a palindrome (164484461).

The spelling of 123143140 in words is "one hundred twenty-three million, one hundred forty-three thousand, one hundred forty".