123743840 has 48 divisors (see below), whose sum is σ = 318926160. Its totient is φ = 44997120.

The previous prime is 123743839. The next prime is 123743881. The reversal of 123743840 is 48347321.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 123743797 and 123743806.

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 7 ways as a sum of consecutive naturals, for example, 33395 + ... + 36914.

It is an arithmetic number, because the mean of its divisors is an integer number (6644295).

Almost surely, 2^123743840 is an apocalyptic number.

123743840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123743840 is an abundant number, since it is smaller than the sum of its proper divisors (195182320).

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

123743840 is a wasteful number, since it uses less digits than its factorization.

123743840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70335 (or 70327 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 123743840 is about 11124.0208557877. The cubic root of 123743840 is about 498.3194780198.

The spelling of 123743840 in words is "one hundred twenty-three million, seven hundred forty-three thousand, eight hundred forty".