123235840 has 240 divisors, whose sum is σ = 380163168. Its totient is φ = 37306368.

The previous prime is 123235831. The next prime is 123235891. The reversal of 123235840 is 48532321.

123235840 is nontrivially palindromic in base 15.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 123235799 and 123235808.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 5358069 + ... + 5358091.

Almost surely, 2^123235840 is an apocalyptic number.

123235840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123235840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190081584).

123235840 is an abundant number, since it is smaller than the sum of its proper divisors (256927328).

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

123235840 is an equidigital number, since it uses as much as digits as its factorization.

123235840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 123235840 is about 11101.1639029428. The cubic root of 123235840 is about 497.6366332628.

The spelling of 123235840 in words is "one hundred twenty-three million, two hundred thirty-five thousand, eight hundred forty".