275138947 has 4 divisors (see below), whose sum is σ = 276827080. Its totient is φ = 273450816.

The previous prime is 275138939. The next prime is 275138957. The reversal of 275138947 is 749831572.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 275138947 - 2³ = 275138939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 275138897 and 275138906.

It is not an unprimeable number, because it can be changed into a prime (275138957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843822 + ... + 844147.

It is an arithmetic number, because the mean of its divisors is an integer number (69206770).

Almost surely, 2^275138947 is an apocalyptic number.

275138947 is a deficient number, since it is larger than the sum of its proper divisors (1688133).

275138947 is a wasteful number, since it uses less digits than its factorization.

275138947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688132.

The product of its digits is 423360, while the sum is 46.

The square root of 275138947 is about 16587.3128324030. The cubic root of 275138947 is about 650.4052281848.

The spelling of 275138947 in words is "two hundred seventy-five million, one hundred thirty-eight thousand, nine hundred forty-seven".