40540261 has 4 divisors (see below), whose sum is σ = 40912300. Its totient is φ = 40168224.

The previous prime is 40540249. The next prime is 40540303. The reversal of 40540261 is 16204504.

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 13176900 + 27363361 = 3630^2 + 5231^2 .

It is a cyclic number.

It is not a de Polignac number, because 40540261 - 2⁷ = 40540133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40540061) 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, 185856 + ... + 186073.

It is an arithmetic number, because the mean of its divisors is an integer number (10228075).

Almost surely, 2^40540261 is an apocalyptic number.

It is an amenable number.

40540261 is a deficient number, since it is larger than the sum of its proper divisors (372039).

40540261 is a wasteful number, since it uses less digits than its factorization.

40540261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372038.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 40540261 is about 6367.1234478373. The cubic root of 40540261 is about 343.5280309802.

Adding to 40540261 its reverse (16204504), we get a palindrome (56744765).

The spelling of 40540261 in words is "forty million, five hundred forty thousand, two hundred sixty-one".