127139807 has 4 divisors (see below), whose sum is σ = 130576056. Its totient is φ = 123703560.

The previous prime is 127139737. The next prime is 127139809. The reversal of 127139807 is 708931721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708931721 = 503 ⋅1409407.

It is a cyclic number.

It is not a de Polignac number, because 127139807 - 2²² = 122945503 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 (127139809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1718069 + ... + 1718142.

It is an arithmetic number, because the mean of its divisors is an integer number (32644014).

Almost surely, 2^127139807 is an apocalyptic number.

127139807 is a deficient number, since it is larger than the sum of its proper divisors (3436249).

127139807 is an equidigital number, since it uses as much as digits as its factorization.

127139807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436248.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 127139807 is about 11275.6288959862. The cubic root of 127139807 is about 502.8369489974.

The spelling of 127139807 in words is "one hundred twenty-seven million, one hundred thirty-nine thousand, eight hundred seven".