127638001 has 4 divisors (see below), whose sum is σ = 128556400. Its totient is φ = 126719604.

The previous prime is 127637987. The next prime is 127638011. The reversal of 127638001 is 100836721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100836721 = 61 ⋅1653061.

It is a cyclic number.

It is not a de Polignac number, because 127638001 - 2⁵ = 127637969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127638011) 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, 458991 + ... + 459268.

It is an arithmetic number, because the mean of its divisors is an integer number (32139100).

Almost surely, 2^127638001 is an apocalyptic number.

It is an amenable number.

127638001 is a deficient number, since it is larger than the sum of its proper divisors (918399).

127638001 is an equidigital number, since it uses as much as digits as its factorization.

127638001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918398.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 127638001 is about 11297.6989250024. The cubic root of 127638001 is about 503.4928774624.

The spelling of 127638001 in words is "one hundred twenty-seven million, six hundred thirty-eight thousand, one".