127995981 has 16 divisors (see below), whose sum is σ = 172368000. Its totient is φ = 84482048.

The previous prime is 127995971. The next prime is 127995983. The reversal of 127995981 is 189599721.

It is a cyclic number.

It is not a de Polignac number, because 127995981 - 2⁷ = 127995853 is a prime.

It is a super-2 number, since 2×127995981² = 32765942304304722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127995983) 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, 224665 + ... + 225233.

It is an arithmetic number, because the mean of its divisors is an integer number (10773000).

Almost surely, 2^127995981 is an apocalyptic number.

It is an amenable number.

127995981 is a deficient number, since it is larger than the sum of its proper divisors (44372019).

127995981 is a wasteful number, since it uses less digits than its factorization.

127995981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188.

The product of its digits is 408240, while the sum is 51.

The square root of 127995981 is about 11313.5308812059. The cubic root of 127995981 is about 503.9631452958.

The spelling of 127995981 in words is "one hundred twenty-seven million, nine hundred ninety-five thousand, nine hundred eighty-one".