7281945 has 48 divisors (see below), whose sum is σ = 14107392. Its totient is φ = 3444480.

The previous prime is 7281943. The next prime is 7281947. The reversal of 7281945 is 5491827.

It is an interprime number because it is at equal distance from previous prime (7281943) and next prime (7281947).

It is not a de Polignac number, because 7281945 - 2¹ = 7281943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7281941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23109 + ... + 23421.

It is an arithmetic number, because the mean of its divisors is an integer number (293904).

Almost surely, 2^7281945 is an apocalyptic number.

It is an amenable number.

7281945 is a deficient number, since it is larger than the sum of its proper divisors (6825447).

7281945 is a wasteful number, since it uses less digits than its factorization.

7281945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 379 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 7281945 is about 2698.5079210556. The cubic root of 7281945 is about 193.8276802632.

The spelling of 7281945 in words is "seven million, two hundred eighty-one thousand, nine hundred forty-five".