40610781 has 8 divisors (see below), whose sum is σ = 60164160. Its totient is φ = 27073836.

The previous prime is 40610767. The next prime is 40610813. The reversal of 40610781 is 18701604.

It is a happy number.

40610781 is a `hidden beast` number, since 40 + 610 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 40610781 - 2⁷ = 40610653 is a prime.

It is a super-2 number, since 2×40610781² = 3298471066859922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1504103 = 40610781 / (4 + 0 + 6 + 1 + 0 + 7 + 8 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40610741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 752025 + ... + 752078.

It is an arithmetic number, because the mean of its divisors is an integer number (7520520).

Almost surely, 2^40610781 is an apocalyptic number.

It is an amenable number.

40610781 is a deficient number, since it is larger than the sum of its proper divisors (19553379).

40610781 is a wasteful number, since it uses less digits than its factorization.

40610781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504112 (or 1504106 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 40610781 is about 6372.6588642418. The cubic root of 40610781 is about 343.7271052080.

The spelling of 40610781 in words is "forty million, six hundred ten thousand, seven hundred eighty-one".