127839421 has 4 divisors (see below), whose sum is σ = 127868832. Its totient is φ = 127810012.

The previous prime is 127839419. The next prime is 127839431. The reversal of 127839421 is 124938721.

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.

It is a cyclic number.

It is not a de Polignac number, because 127839421 - 2¹ = 127839419 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 (127839431) 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, 6751 + ... + 17356.

It is an arithmetic number, because the mean of its divisors is an integer number (31967208).

Almost surely, 2^127839421 is an apocalyptic number.

It is an amenable number.

127839421 is a deficient number, since it is larger than the sum of its proper divisors (29411).

127839421 is an equidigital number, since it uses as much as digits as its factorization.

127839421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29410.

The product of its digits is 24192, while the sum is 37.

The square root of 127839421 is about 11306.6096156186. The cubic root of 127839421 is about 503.7575850360.

The spelling of 127839421 in words is "one hundred twenty-seven million, eight hundred thirty-nine thousand, four hundred twenty-one".