275380821 has 12 divisors (see below), whose sum is σ = 399972300. Its totient is φ = 182571840.

The previous prime is 275380799. The next prime is 275380867. The reversal of 275380821 is 128083572.

275380821 is a `hidden beast` number, since 275 + 380 + 8 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51279921 + 224100900 = 7161^2 + 14970^2 .

It is not a de Polignac number, because 275380821 - 2¹¹ = 275378773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275380891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82896 + ... + 86153.

It is an arithmetic number, because the mean of its divisors is an integer number (33331025).

Almost surely, 2^275380821 is an apocalyptic number.

It is an amenable number.

275380821 is a deficient number, since it is larger than the sum of its proper divisors (124591479).

275380821 is a wasteful number, since it uses less digits than its factorization.

275380821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169236 (or 169233 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 275380821 is about 16594.6021645594. The cubic root of 275380821 is about 650.5957622642.

The spelling of 275380821 in words is "two hundred seventy-five million, three hundred eighty thousand, eight hundred twenty-one".