40808186 has 4 divisors (see below), whose sum is σ = 61212282. Its totient is φ = 20404092.

The previous prime is 40808167. The next prime is 40808213. The reversal of 40808186 is 68180804.

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

It can be written as a sum of positive squares in only one way, i.e., 39450961 + 1357225 = 6281^2 + 1165^2 .

It is a super-2 number, since 2×40808186² = 3330616089221192, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202045 + ... + 10202048.

Almost surely, 2^40808186 is an apocalyptic number.

40808186 is a deficient number, since it is larger than the sum of its proper divisors (20404096).

40808186 is a wasteful number, since it uses less digits than its factorization.

40808186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20404095.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 40808186 is about 6388.1285209363. The cubic root of 40808186 is about 344.2831464077.

The spelling of 40808186 in words is "forty million, eight hundred eight thousand, one hundred eighty-six".