40518261 has 24 divisors (see below), whose sum is σ = 67279680. Its totient is φ = 23017536.

The previous prime is 40518253. The next prime is 40518263. The reversal of 40518261 is 16281504.

It is not a de Polignac number, because 40518261 - 2³ = 40518253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40518263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9481 + ... + 13073.

It is an arithmetic number, because the mean of its divisors is an integer number (2803320).

Almost surely, 2^40518261 is an apocalyptic number.

It is an amenable number.

40518261 is a deficient number, since it is larger than the sum of its proper divisors (26761419).

40518261 is a wasteful number, since it uses less digits than its factorization.

40518261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3785 (or 3782 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 40518261 is about 6365.3955886496. The cubic root of 40518261 is about 343.4658789039.

Adding to 40518261 its reverse (16281504), we get a palindrome (56799765).

The spelling of 40518261 in words is "forty million, five hundred eighteen thousand, two hundred sixty-one".