127199917 has 8 divisors (see below), whose sum is σ = 140326200. Its totient is φ = 114551040.

The previous prime is 127199911. The next prime is 127199921. The reversal of 127199917 is 719991721.

It can be written as a sum of positive squares in 4 ways, for example, as 16760836 + 110439081 = 4094^2 + 10509^2 .

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 127199917 - 2¹⁹ = 126675629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127199911) 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, 118792 + ... + 119857.

It is an arithmetic number, because the mean of its divisors is an integer number (17540775).

Almost surely, 2^127199917 is an apocalyptic number.

It is an amenable number.

127199917 is a deficient number, since it is larger than the sum of its proper divisors (13126283).

127199917 is a wasteful number, since it uses less digits than its factorization.

127199917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238703.

The product of its digits is 71442, while the sum is 46.

The square root of 127199917 is about 11278.2940642634. The cubic root of 127199917 is about 502.9161813730.

The spelling of 127199917 in words is "one hundred twenty-seven million, one hundred ninety-nine thousand, nine hundred seventeen".