40485781 has 8 divisors (see below), whose sum is σ = 46393344. Its totient is φ = 34609200.

The previous prime is 40485743. The next prime is 40485787. The reversal of 40485781 is 18758404.

40485781 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 a cyclic number.

It is not a de Polignac number, because 40485781 - 2¹³ = 40477589 is a prime.

It is a super-2 number, since 2×40485781² = 3278196926359922, 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 40485781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40485787) 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, 4870 + ... + 10231.

It is an arithmetic number, because the mean of its divisors is an integer number (5799168).

Almost surely, 2^40485781 is an apocalyptic number.

It is an amenable number.

40485781 is a deficient number, since it is larger than the sum of its proper divisors (5907563).

40485781 is a wasteful number, since it uses less digits than its factorization.

40485781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15491.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 40485781 is about 6362.8437824608. The cubic root of 40485781 is about 343.3740786993.

The spelling of 40485781 in words is "forty million, four hundred eighty-five thousand, seven hundred eighty-one".