40683781 has 8 divisors (see below), whose sum is σ = 42681600. Its totient is φ = 38725680.

The previous prime is 40683761. The next prime is 40683793. The reversal of 40683781 is 18738604.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40683781 - 2¹³ = 40675589 is a prime.

It is a super-2 number, since 2×40683781² = 3310340072911922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40683781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40683761) 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 7 ways as a sum of consecutive naturals, for example, 7821 + ... + 11938.

It is an arithmetic number, because the mean of its divisors is an integer number (5335200).

Almost surely, 2^40683781 is an apocalyptic number.

40683781 is the 2853-rd centered decagonal number.

It is an amenable number.

40683781 is a deficient number, since it is larger than the sum of its proper divisors (1997819).

40683781 is a wasteful number, since it uses less digits than its factorization.

40683781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19859.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 40683781 is about 6378.3838862207. The cubic root of 40683781 is about 343.9329377339.

The spelling of 40683781 in words is "forty million, six hundred eighty-three thousand, seven hundred eighty-one".