40686890 has 16 divisors (see below), whose sum is σ = 73316232. Its totient is φ = 16257024.

The previous prime is 40686871. The next prime is 40686907. The reversal of 40686890 is 9868604.

40686890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 37662769 + 3024121 = 6137^2 + 1739^2 .

It is an unprimeable number.

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, 11402 + ... + 14538.

Almost surely, 2^40686890 is an apocalyptic number.

40686890 is a deficient number, since it is larger than the sum of its proper divisors (32629342).

40686890 is a wasteful number, since it uses less digits than its factorization.

40686890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 40686890 is about 6378.6275953374. The cubic root of 40686890 is about 343.9416984754.

The spelling of 40686890 in words is "forty million, six hundred eighty-six thousand, eight hundred ninety".