127957421 has 4 divisors (see below), whose sum is σ = 128168832. Its totient is φ = 127746012.

The previous prime is 127957399. The next prime is 127957451. The reversal of 127957421 is 124759721.

It is a happy number.

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: 124759721 = 53 ⋅2353957.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127957421 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 (127957451) 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, 104795 + ... + 106008.

It is an arithmetic number, because the mean of its divisors is an integer number (32042208).

Almost surely, 2^127957421 is an apocalyptic number.

It is an amenable number.

127957421 is a deficient number, since it is larger than the sum of its proper divisors (211411).

127957421 is an equidigital number, since it uses as much as digits as its factorization.

127957421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211410.

The product of its digits is 35280, while the sum is 38.

The square root of 127957421 is about 11311.8265987417. The cubic root of 127957421 is about 503.9125323247.

The spelling of 127957421 in words is "one hundred twenty-seven million, nine hundred fifty-seven thousand, four hundred twenty-one".