40785813 has 12 divisors (see below), whose sum is σ = 59049900. Its totient is φ = 27127296.

The previous prime is 40785809. The next prime is 40785817. The reversal of 40785813 is 31858704.

40785813 is a `hidden beast` number, since 4 + 0 + 78 + 581 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (40785809) and next prime (40785817).

It can be written as a sum of positive squares in 2 ways, for example, as 22867524 + 17918289 = 4782^2 + 4233^2 .

It is not a de Polignac number, because 40785813 - 2² = 40785809 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40785817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1006 + ... + 9087.

It is an arithmetic number, because the mean of its divisors is an integer number (4920825).

Almost surely, 2^40785813 is an apocalyptic number.

It is an amenable number.

40785813 is a deficient number, since it is larger than the sum of its proper divisors (18264087).

40785813 is a wasteful number, since it uses less digits than its factorization.

40785813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10548 (or 10545 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 40785813 is about 6386.3771420110. The cubic root of 40785813 is about 344.2202174085.

The spelling of 40785813 in words is "forty million, seven hundred eighty-five thousand, eight hundred thirteen".