127972821 has 8 divisors (see below), whose sum is σ = 180667584. Its totient is φ = 80296640.

The previous prime is 127972813. The next prime is 127972843. The reversal of 127972821 is 128279721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 127972821 - 2³ = 127972813 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 127972821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127972891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1254585 + ... + 1254686.

It is an arithmetic number, because the mean of its divisors is an integer number (22583448).

Almost surely, 2^127972821 is an apocalyptic number.

It is an amenable number.

127972821 is a deficient number, since it is larger than the sum of its proper divisors (52694763).

127972821 is a wasteful number, since it uses less digits than its factorization.

127972821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509291.

The product of its digits is 28224, while the sum is 39.

The square root of 127972821 is about 11312.5072817656. The cubic root of 127972821 is about 503.9327472307.

The spelling of 127972821 in words is "one hundred twenty-seven million, nine hundred seventy-two thousand, eight hundred twenty-one".