40127781 has 8 divisors (see below), whose sum is σ = 53542944. Its totient is φ = 26732240.

The previous prime is 40127779. The next prime is 40127827. The reversal of 40127781 is 18772104.

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 40127781 - 2¹ = 40127779 is a prime.

It is a super-2 number, since 2×40127781² = 3220477615967922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40127741) 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, 826 + ... + 8996.

It is an arithmetic number, because the mean of its divisors is an integer number (6692868).

Almost surely, 2^40127781 is an apocalyptic number.

It is an amenable number.

40127781 is a deficient number, since it is larger than the sum of its proper divisors (13415163).

40127781 is a wasteful number, since it uses less digits than its factorization.

40127781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9811.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 40127781 is about 6334.6492404868. The cubic root of 40127781 is about 342.3589729653.

Adding to 40127781 its reverse (18772104), we get a palindrome (58899885).

It can be divided in two parts, 401 and 27781, that added together give a palindrome (28182).

The spelling of 40127781 in words is "forty million, one hundred twenty-seven thousand, seven hundred eighty-one".