123144240 has 40 divisors (see below), whose sum is σ = 381747888. Its totient is φ = 32838400.

The previous prime is 123144223. The next prime is 123144257. The reversal of 123144240 is 42441321.

It is an interprime number because it is at equal distance from previous prime (123144223) and next prime (123144257).

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256311 + ... + 256790.

Almost surely, 2^123144240 is an apocalyptic number.

123144240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123144240 is an abundant number, since it is smaller than the sum of its proper divisors (258603648).

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

123144240 is a wasteful number, since it uses less digits than its factorization.

123144240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513117 (or 513111 counting only the distinct ones).

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

The square root of 123144240 is about 11097.0374424889. The cubic root of 123144240 is about 497.5133065471.

Adding to 123144240 its reverse (42441321), we get a palindrome (165585561).

The spelling of 123144240 in words is "one hundred twenty-three million, one hundred forty-four thousand, two hundred forty".