7972281 has 18 divisors (see below), whose sum is σ = 11795082. Its totient is φ = 5188800.

The previous prime is 7972277. The next prime is 7972291. The reversal of 7972281 is 1822797.

It can be written as a sum of positive squares in only one way, i.e., 7952400 + 19881 = 2820^2 + 141^2 .

It is not a de Polignac number, because 7972281 - 2² = 7972277 is a prime.

It is a super-2 number, since 2×7972281² = 127114528685922, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7972231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 19681 + ... + 20081.

Almost surely, 2^7972281 is an apocalyptic number.

It is an amenable number.

7972281 is a deficient number, since it is larger than the sum of its proper divisors (3822801).

7972281 is a wasteful number, since it uses less digits than its factorization.

7972281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 451 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 7972281 is about 2823.5227996246. The cubic root of 7972281 is about 199.7687410328.

The spelling of 7972281 in words is "seven million, nine hundred seventy-two thousand, two hundred eighty-one".