40991986 has 32 divisors (see below), whose sum is σ = 72547200. Its totient is φ = 17006976.

The previous prime is 40991983. The next prime is 40992001. The reversal of 40991986 is 68919904.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a pancake number, because a pancake can be divided into 40991986 parts by 9054 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (40991983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89470 + ... + 89926.

It is an arithmetic number, because the mean of its divisors is an integer number (2267100).

Almost surely, 2^40991986 is an apocalyptic number.

40991986 is a deficient number, since it is larger than the sum of its proper divisors (31555214).

40991986 is a wasteful number, since it uses less digits than its factorization.

40991986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 40991986 is about 6402.4984185863. The cubic root of 40991986 is about 344.7992558971.

The spelling of 40991986 in words is "forty million, nine hundred ninety-one thousand, nine hundred eighty-six".