40218263 has 4 divisors (see below), whose sum is σ = 40281648. Its totient is φ = 40154880.

The previous prime is 40218251. The next prime is 40218281. The reversal of 40218263 is 36281204.

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

It is a cyclic number.

It is not a de Polignac number, because 40218263 - 2⁴ = 40218247 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 (40218293) 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, 30731 + ... + 32012.

It is an arithmetic number, because the mean of its divisors is an integer number (10070412).

Almost surely, 2^40218263 is an apocalyptic number.

40218263 is a deficient number, since it is larger than the sum of its proper divisors (63385).

40218263 is an equidigital number, since it uses as much as digits as its factorization.

40218263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63384.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 40218263 is about 6341.7870509818. The cubic root of 40218263 is about 342.6161021487.

Adding to 40218263 its reverse (36281204), we get a palindrome (76499467).

The spelling of 40218263 in words is "forty million, two hundred eighteen thousand, two hundred sixty-three".