127920499 has 4 divisors (see below), whose sum is σ = 146194864. Its totient is φ = 109646136.

The previous prime is 127920491. The next prime is 127920517. The reversal of 127920499 is 994029721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994029721 = 1471 ⋅675751.

It is a cyclic number.

It is not a de Polignac number, because 127920499 - 2³ = 127920491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127920491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9137172 + ... + 9137185.

It is an arithmetic number, because the mean of its divisors is an integer number (36548716).

Almost surely, 2^127920499 is an apocalyptic number.

127920499 is a deficient number, since it is larger than the sum of its proper divisors (18274365).

127920499 is an equidigital number, since it uses as much as digits as its factorization.

127920499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18274364.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 127920499 is about 11310.1944722449. The cubic root of 127920499 is about 503.8640598245.

The spelling of 127920499 in words is "one hundred twenty-seven million, nine hundred twenty thousand, four hundred ninety-nine".