275439721 has 4 divisors (see below), whose sum is σ = 278014032. Its totient is φ = 272865412.

The previous prime is 275439691. The next prime is 275439727. The reversal of 275439721 is 127934572.

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 a de Polignac number, because none of the positive numbers 2^k-275439721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (275439727) 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, 1286995 + ... + 1287208.

It is an arithmetic number, because the mean of its divisors is an integer number (69503508).

Almost surely, 2^275439721 is an apocalyptic number.

It is an amenable number.

275439721 is a deficient number, since it is larger than the sum of its proper divisors (2574311).

275439721 is a wasteful number, since it uses less digits than its factorization.

275439721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574310.

The product of its digits is 105840, while the sum is 40.

The square root of 275439721 is about 16596.3767431328. The cubic root of 275439721 is about 650.6421433188.

The spelling of 275439721 in words is "two hundred seventy-five million, four hundred thirty-nine thousand, seven hundred twenty-one".