7271905 has 4 divisors (see below), whose sum is σ = 8726292. Its totient is φ = 5817520.

The previous prime is 7271897. The next prime is 7271911. The reversal of 7271905 is 5091727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5091727 = 1021 ⋅4987.

It can be written as a sum of positive squares in 2 ways, for example, as 1852321 + 5419584 = 1361^2 + 2328^2 .

It is not a de Polignac number, because 7271905 - 2³ = 7271897 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727186 + ... + 727195.

It is an arithmetic number, because the mean of its divisors is an integer number (2181573).

Almost surely, 2^7271905 is an apocalyptic number.

It is an amenable number.

7271905 is a deficient number, since it is larger than the sum of its proper divisors (1454387).

7271905 is a wasteful number, since it uses less digits than its factorization.

7271905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454386.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 7271905 is about 2696.6469920996. The cubic root of 7271905 is about 193.7385591579.

The spelling of 7271905 in words is "seven million, two hundred seventy-one thousand, nine hundred five".