40818636 has 18 divisors (see below), whose sum is σ = 103180532. Its totient is φ = 13606200.

The previous prime is 40818523. The next prime is 40818671. The reversal of 40818636 is 63681804.

It is a happy number.

40818636 is a `hidden beast` number, since 4 + 0 + 8 + 18 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×40818636² = 3332322089800992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1133851 = 40818636 / (4 + 0 + 8 + 1 + 8 + 6 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 40818636.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 566890 + ... + 566961.

Almost surely, 2^40818636 is an apocalyptic number.

It is an amenable number.

40818636 is an abundant number, since it is smaller than the sum of its proper divisors (62361896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40818636 is a wasteful number, since it uses less digits than its factorization.

40818636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133861 (or 1133856 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 40818636 is about 6388.9463920118. The cubic root of 40818636 is about 344.3125314583.

It can be divided in two parts, 408 and 18636, that added together give a square (19044 = 138²).

The spelling of 40818636 in words is "forty million, eight hundred eighteen thousand, six hundred thirty-six".