127638647 has 2 divisors, whose sum is σ = 127638648. Its totient is φ = 127638646.

The previous prime is 127638631. The next prime is 127638659. The reversal of 127638647 is 746836721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 127638647 - 2⁴ = 127638631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 127638598 and 127638607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127638607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63819323 + 63819324.

It is an arithmetic number, because the mean of its divisors is an integer number (63819324).

Almost surely, 2^127638647 is an apocalyptic number.

127638647 is a deficient number, since it is larger than the sum of its proper divisors (1).

127638647 is an equidigital number, since it uses as much as digits as its factorization.

127638647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 44.

The square root of 127638647 is about 11297.7275148589. The cubic root of 127638647 is about 503.4937268851.

The spelling of 127638647 in words is "one hundred twenty-seven million, six hundred thirty-eight thousand, six hundred forty-seven".