40723281 has 12 divisors (see below), whose sum is σ = 58912308. Its totient is φ = 27107424.

The previous prime is 40723259. The next prime is 40723283. The reversal of 40723281 is 18232704.

40723281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 19184400 + 21538881 = 4380^2 + 4641^2 .

It is not a de Polignac number, because 40723281 - 2⁷ = 40723153 is a prime.

It is a super-2 number, since 2×40723281² = 3316771230809922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40723283) 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 11 ways as a sum of consecutive naturals, for example, 3511 + ... + 9683.

It is an arithmetic number, because the mean of its divisors is an integer number (4909359).

Almost surely, 2^40723281 is an apocalyptic number.

It is an amenable number.

40723281 is a deficient number, since it is larger than the sum of its proper divisors (18189027).

40723281 is a wasteful number, since it uses less digits than its factorization.

40723281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6912 (or 6909 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 40723281 is about 6381.4795306418. The cubic root of 40723281 is about 344.0442102229.

Adding to 40723281 its reverse (18232704), we get a palindrome (58955985).

The spelling of 40723281 in words is "forty million, seven hundred twenty-three thousand, two hundred eighty-one".