40007761 has 4 divisors (see below), whose sum is σ = 40187392. Its totient is φ = 39828132.

The previous prime is 40007729. The next prime is 40007801. The reversal of 40007761 is 16770004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40007761 - 2⁵ = 40007729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40037761) 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 3 ways as a sum of consecutive naturals, for example, 89481 + ... + 89926.

It is an arithmetic number, because the mean of its divisors is an integer number (10046848).

Almost surely, 2^40007761 is an apocalyptic number.

It is an amenable number.

40007761 is a deficient number, since it is larger than the sum of its proper divisors (179631).

40007761 is a wasteful number, since it uses less digits than its factorization.

40007761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179630.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 40007761 is about 6325.1688515011. The cubic root of 40007761 is about 342.0173064438.

Adding to 40007761 its reverse (16770004), we get a palindrome (56777765).

The spelling of 40007761 in words is "forty million, seven thousand, seven hundred sixty-one".