127406981 has 8 divisors (see below), whose sum is σ = 137706744. Its totient is φ = 117178560.

The previous prime is 127406977. The next prime is 127407001. The reversal of 127406981 is 189604721.

It can be written as a sum of positive squares in 4 ways, for example, as 6604900 + 120802081 = 2570^2 + 10991^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 127406981 - 2² = 127406977 is a prime.

It is a super-2 number, since 2×127406981² = 32465077615068722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127406911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14090 + ... + 21291.

It is an arithmetic number, because the mean of its divisors is an integer number (17213343).

Almost surely, 2^127406981 is an apocalyptic number.

It is an amenable number.

127406981 is a deficient number, since it is larger than the sum of its proper divisors (10299763).

127406981 is a wasteful number, since it uses less digits than its factorization.

127406981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35671.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 127406981 is about 11287.4700885539. The cubic root of 127406981 is about 503.1889262600.

The spelling of 127406981 in words is "one hundred twenty-seven million, four hundred six thousand, nine hundred eighty-one".