124999920 has 120 divisors (see below), whose sum is σ = 423150000. Its totient is φ = 33067008.

The previous prime is 124999907. The next prime is 124999921. The reversal of 124999920 is 29999421.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124999921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99456 + ... + 100704.

It is an arithmetic number, because the mean of its divisors is an integer number (3526250).

Almost surely, 2^124999920 is an apocalyptic number.

124999920 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 124999920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211575000).

124999920 is an abundant number, since it is smaller than the sum of its proper divisors (298150080).

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

124999920 is a wasteful number, since it uses less digits than its factorization.

124999920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407 (or 1398 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 124999920 is about 11180.3363097896. The cubic root of 124999920 is about 499.9998933333. Note that the first 3 decimals are identical.

The spelling of 124999920 in words is "one hundred twenty-four million, nine hundred ninety-nine thousand, nine hundred twenty".