40518557 has 4 divisors (see below), whose sum is σ = 40615680. Its totient is φ = 40421436.

The previous prime is 40518509. The next prime is 40518563. The reversal of 40518557 is 75581504.

40518557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40518557 - 2¹⁸ = 40256413 is a prime.

It is a super-2 number, since 2×40518557² = 3283506922724498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40518757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47933 + ... + 48770.

It is an arithmetic number, because the mean of its divisors is an integer number (10153920).

Almost surely, 2^40518557 is an apocalyptic number.

It is an amenable number.

40518557 is a deficient number, since it is larger than the sum of its proper divisors (97123).

40518557 is an equidigital number, since it uses as much as digits as its factorization.

40518557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97122.

The product of its (nonzero) digits is 28000, while the sum is 35.

The square root of 40518557 is about 6365.4188393224. The cubic root of 40518557 is about 343.4667152811.

The spelling of 40518557 in words is "forty million, five hundred eighteen thousand, five hundred fifty-seven".