40686249 has 8 divisors (see below), whose sum is σ = 54336832. Its totient is φ = 27079920.

The previous prime is 40686221. The next prime is 40686259. The reversal of 40686249 is 94268604.

40686249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40686249 - 2⁹ = 40685737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40686209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8854 + ... + 12639.

It is an arithmetic number, because the mean of its divisors is an integer number (6792104).

Almost surely, 2^40686249 is an apocalyptic number.

It is an amenable number.

40686249 is a deficient number, since it is larger than the sum of its proper divisors (13650583).

40686249 is a wasteful number, since it uses less digits than its factorization.

40686249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22127.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 40686249 is about 6378.5773492214. The cubic root of 40686249 is about 343.9398922606.

The spelling of 40686249 in words is "forty million, six hundred eighty-six thousand, two hundred forty-nine".