40218529 has 4 divisors (see below), whose sum is σ = 43312276. Its totient is φ = 37124784.

The previous prime is 40218517. The next prime is 40218569. The reversal of 40218529 is 92581204.

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 3069504 + 37149025 = 1752^2 + 6095^2 .

It is a cyclic number.

It is not a de Polignac number, because 40218529 - 2¹⁹ = 39694241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40218529.

It is not an unprimeable number, because it can be changed into a prime (40218569) 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, 1546854 + ... + 1546879.

It is an arithmetic number, because the mean of its divisors is an integer number (10828069).

Almost surely, 2^40218529 is an apocalyptic number.

It is an amenable number.

40218529 is a deficient number, since it is larger than the sum of its proper divisors (3093747).

40218529 is a wasteful number, since it uses less digits than its factorization.

40218529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093746.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 40218529 is about 6341.8080229537. The cubic root of 40218529 is about 342.6168574911.

The spelling of 40218529 in words is "forty million, two hundred eighteen thousand, five hundred twenty-nine".