127997556 has 48 divisors (see below), whose sum is σ = 318427200. Its totient is φ = 39877120.

The previous prime is 127997549. The next prime is 127997557. The reversal of 127997556 is 655799721.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 127997499 and 127997508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127997557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28291 + ... + 32501.

It is an arithmetic number, because the mean of its divisors is an integer number (6633900).

Almost surely, 2^127997556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 127997556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159213600).

127997556 is an abundant number, since it is smaller than the sum of its proper divisors (190429644).

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

127997556 is a wasteful number, since it uses less digits than its factorization.

127997556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4384 (or 4382 counting only the distinct ones).

The product of its digits is 1190700, while the sum is 51.

The square root of 127997556 is about 11313.6004879083. The cubic root of 127997556 is about 503.9652123885.

The spelling of 127997556 in words is "one hundred twenty-seven million, nine hundred ninety-seven thousand, five hundred fifty-six".