40807781 has 8 divisors (see below), whose sum is σ = 47898240. Its totient is φ = 34032528.

The previous prime is 40807777. The next prime is 40807783. The reversal of 40807781 is 18770804.

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 40807781 - 2² = 40807777 is a prime.

It is a super-2 number, since 2×40807781² = 3330549980287922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40807783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78521 + ... + 79038.

It is an arithmetic number, because the mean of its divisors is an integer number (5987280).

Almost surely, 2^40807781 is an apocalyptic number.

It is an amenable number.

40807781 is a deficient number, since it is larger than the sum of its proper divisors (7090459).

40807781 is a wasteful number, since it uses less digits than its factorization.

40807781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157603.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 40807781 is about 6388.0968214328. The cubic root of 40807781 is about 344.2820074603.

The spelling of 40807781 in words is "forty million, eight hundred seven thousand, seven hundred eighty-one".