123435856 has 40 divisors (see below), whose sum is σ = 253505600. Its totient is φ = 58060800.

The previous prime is 123435853. The next prime is 123435859. The reversal of 123435856 is 658534321.

It is an interprime number because it is at equal distance from previous prime (123435853) and next prime (123435859).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123435853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44560 + ... + 47248.

It is an arithmetic number, because the mean of its divisors is an integer number (6337640).

Almost surely, 2^123435856 is an apocalyptic number.

123435856 is a gapful number since it is divisible by the number (16) 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 123435856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126752800).

123435856 is an abundant number, since it is smaller than the sum of its proper divisors (130069744).

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

123435856 is a wasteful number, since it uses less digits than its factorization.

123435856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867 (or 2861 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 123435856 is about 11110.1690356178. The cubic root of 123435856 is about 497.9057148536.

The spelling of 123435856 in words is "one hundred twenty-three million, four hundred thirty-five thousand, eight hundred fifty-six".