126399980 has 96 divisors (see below), whose sum is σ = 317399040. Its totient is φ = 41368320.

The previous prime is 126399979. The next prime is 126400013. The reversal of 126399980 is 89993621.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 661685 + ... + 661875.

It is an arithmetic number, because the mean of its divisors is an integer number (3306240).

Almost surely, 2^126399980 is an apocalyptic number.

126399980 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 126399980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158699520).

126399980 is an abundant number, since it is smaller than the sum of its proper divisors (190999060).

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

126399980 is a wasteful number, since it uses less digits than its factorization.

126399980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 126399980 is about 11242.7745685840. The cubic root of 126399980 is about 501.8597143492.

The spelling of 126399980 in words is "one hundred twenty-six million, three hundred ninety-nine thousand, nine hundred eighty".