123432240 has 80 divisors (see below), whose sum is σ = 405161568. Its totient is φ = 30978048.

The previous prime is 123432233. The next prime is 123432271. The reversal of 123432240 is 42234321.

It is a tau number, because it is divible by the number of its divisors (80).

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, 11047 + ... + 19206.

Almost surely, 2^123432240 is an apocalyptic number.

123432240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123432240 is an abundant number, since it is smaller than the sum of its proper divisors (281729328).

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

123432240 is a wasteful number, since it uses less digits than its factorization.

123432240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30286 (or 30280 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 123432240 is about 11110.0063006283. The cubic root of 123432240 is about 497.9008528286.

Adding to 123432240 its reverse (42234321), we get a palindrome (165666561).

The spelling of 123432240 in words is "one hundred twenty-three million, four hundred thirty-two thousand, two hundred forty".