123440142 has 32 divisors (see below), whose sum is σ = 288156672. Its totient is φ = 34517664.

The previous prime is 123440137. The next prime is 123440167. The reversal of 123440142 is 241044321.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29293 + ... + 33240.

It is an arithmetic number, because the mean of its divisors is an integer number (9004896).

Almost surely, 2^123440142 is an apocalyptic number.

123440142 is an abundant number, since it is smaller than the sum of its proper divisors (164716530).

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

123440142 is a wasteful number, since it uses less digits than its factorization.

123440142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62592.

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

The square root of 123440142 is about 11110.3619202976. The cubic root of 123440142 is about 497.9114776286.

Adding to 123440142 its reverse (241044321), we get a palindrome (364484463).

The spelling of 123440142 in words is "one hundred twenty-three million, four hundred forty thousand, one hundred forty-two".