40187818 has 16 divisors (see below), whose sum is σ = 65933280. Its totient is φ = 18219600.

The previous prime is 40187801. The next prime is 40187821. The reversal of 40187818 is 81878104.

It is a super-2 number, since 2×40187818² = 3230121431202248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7093 + ... + 11431.

It is an arithmetic number, because the mean of its divisors is an integer number (4120830).

Almost surely, 2^40187818 is an apocalyptic number.

40187818 is a deficient number, since it is larger than the sum of its proper divisors (25745462).

40187818 is a wasteful number, since it uses less digits than its factorization.

40187818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 40187818 is about 6339.3862478950. The cubic root of 40187818 is about 342.5296275008.

The spelling of 40187818 in words is "forty million, one hundred eighty-seven thousand, eight hundred eighteen".