40218541 has 4 divisors (see below), whose sum is σ = 43874784. Its totient is φ = 36562300.

The previous prime is 40218517. The next prime is 40218569. The reversal of 40218541 is 14581204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40218541 - 2¹¹ = 40216493 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 (40218571) 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, 1828105 + ... + 1828126.

It is an arithmetic number, because the mean of its divisors is an integer number (10968696).

Almost surely, 2^40218541 is an apocalyptic number.

It is an amenable number.

40218541 is a deficient number, since it is larger than the sum of its proper divisors (3656243).

40218541 is a wasteful number, since it uses less digits than its factorization.

40218541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656242.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 40218541 is about 6341.8089690561. The cubic root of 40218541 is about 342.6168915666.

Adding to 40218541 its reverse (14581204), we get a palindrome (54799745).

The spelling of 40218541 in words is "forty million, two hundred eighteen thousand, five hundred forty-one".