40257281 has 4 divisors (see below), whose sum is σ = 40709700. Its totient is φ = 39804864.

The previous prime is 40257271. The next prime is 40257289. The reversal of 40257281 is 18275204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19280881 + 20976400 = 4391^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 40257281 - 2¹⁰ = 40256257 is a prime.

It is a super-2 number, since 2×40257281² = 3241297347025922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40257289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226076 + ... + 226253.

It is an arithmetic number, because the mean of its divisors is an integer number (10177425).

Almost surely, 2^40257281 is an apocalyptic number.

It is an amenable number.

40257281 is a deficient number, since it is larger than the sum of its proper divisors (452419).

40257281 is an equidigital number, since it uses as much as digits as its factorization.

40257281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452418.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 40257281 is about 6344.8625674635. The cubic root of 40257281 is about 342.7268633910.

The spelling of 40257281 in words is "forty million, two hundred fifty-seven thousand, two hundred eighty-one".