40517818 has 12 divisors (see below), whose sum is σ = 66804570. Its totient is φ = 18417080.

The previous prime is 40517809. The next prime is 40517819. The reversal of 40517818 is 81871504.

It can be written as a sum of positive squares in only one way, i.e., 29408929 + 11108889 = 5423^2 + 3333^2 .

It is a super-2 number, since 2×40517818² = 3283387150962248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40517819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83473 + ... + 83956.

Almost surely, 2^40517818 is an apocalyptic number.

40517818 is a deficient number, since it is larger than the sum of its proper divisors (26286752).

40517818 is a wasteful number, since it uses less digits than its factorization.

40517818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167453 (or 167442 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 40517818 is about 6365.3607910314. The cubic root of 40517818 is about 343.4646271560.

The spelling of 40517818 in words is "forty million, five hundred seventeen thousand, eight hundred eighteen".