123899520 has 128 divisors (see below), whose sum is σ = 403626240. Its totient is φ = 32313344.

The previous prime is 123899509. The next prime is 123899527. The reversal of 123899520 is 25998321.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (123899527) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 89554 + ... + 90926.

It is an arithmetic number, because the mean of its divisors is an integer number (3153330).

Almost surely, 2^123899520 is an apocalyptic number.

123899520 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 123899520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201813120).

123899520 is an abundant number, since it is smaller than the sum of its proper divisors (279726720).

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

123899520 is a wasteful number, since it uses less digits than its factorization.

123899520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442 (or 1430 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 123899520 is about 11131.0161261225. The cubic root of 123899520 is about 498.5283661706.

The spelling of 123899520 in words is "one hundred twenty-three million, eight hundred ninety-nine thousand, five hundred twenty".