40518253 has 2 divisors, whose sum is σ = 40518254. Its totient is φ = 40518252.

The previous prime is 40518239. The next prime is 40518263. The reversal of 40518253 is 35281504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39463524 + 1054729 = 6282^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 40518253 - 2¹⁷ = 40387181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40518223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20259126 + 20259127.

It is an arithmetic number, because the mean of its divisors is an integer number (20259127).

Almost surely, 2^40518253 is an apocalyptic number.

It is an amenable number.

40518253 is a deficient number, since it is larger than the sum of its proper divisors (1).

40518253 is an equidigital number, since it uses as much as digits as its factorization.

40518253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 40518253 is about 6365.3949602519. The cubic root of 40518253 is about 343.4658562990.

Adding to 40518253 its reverse (35281504), we get a palindrome (75799757).

The spelling of 40518253 in words is "forty million, five hundred eighteen thousand, two hundred fifty-three".