127972799 has 4 divisors (see below), whose sum is σ = 128001336. Its totient is φ = 127944264.

The previous prime is 127972783. The next prime is 127972813. The reversal of 127972799 is 997279721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 127972799 - 2⁴ = 127972783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 127972799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127972769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5909 + ... + 17054.

It is an arithmetic number, because the mean of its divisors is an integer number (32000334).

Almost surely, 2^127972799 is an apocalyptic number.

127972799 is a deficient number, since it is larger than the sum of its proper divisors (28537).

127972799 is an equidigital number, since it uses as much as digits as its factorization.

127972799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28536.

The product of its digits is 1000188, while the sum is 53.

The square root of 127972799 is about 11312.5063093905. The cubic root of 127972799 is about 503.9327183534.

The spelling of 127972799 in words is "one hundred twenty-seven million, nine hundred seventy-two thousand, seven hundred ninety-nine".