40186216 has 64 divisors (see below), whose sum is σ = 91584000. Its totient is φ = 16148160.

The previous prime is 40186207. The next prime is 40186217. The reversal of 40186216 is 61268104.

It is a super-2 number, since 2×40186216² = 3229863912797312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (40186217) 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 15 ways as a sum of consecutive naturals, for example, 190351 + ... + 190561.

It is an arithmetic number, because the mean of its divisors is an integer number (1431000).

Almost surely, 2^40186216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40186216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45792000).

40186216 is an abundant number, since it is smaller than the sum of its proper divisors (51397784).

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

40186216 is a wasteful number, since it uses less digits than its factorization.

40186216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 40186216 is about 6339.2598937100. The cubic root of 40186216 is about 342.5250760407.

The spelling of 40186216 in words is "forty million, one hundred eighty-six thousand, two hundred sixteen".