123955920 has 400 divisors, whose sum is σ = 492611328. Its totient is φ = 28615680.

The previous prime is 123955919. The next prime is 123955921. The reversal of 123955920 is 29559321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123955919) and next prime (123955921).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123955921) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2637337 + ... + 2637383.

Almost surely, 2^123955920 is an apocalyptic number.

123955920 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 123955920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246305664).

123955920 is an abundant number, since it is smaller than the sum of its proper divisors (368655408).

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

123955920 is a wasteful number, since it uses less digits than its factorization.

123955920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 123955920 is about 11133.5492993025. The cubic root of 123955920 is about 498.6039993250.

The spelling of 123955920 in words is "one hundred twenty-three million, nine hundred fifty-five thousand, nine hundred twenty".