40387705 has 4 divisors (see below), whose sum is σ = 48465252. Its totient is φ = 32310160.

The previous prime is 40387703. The next prime is 40387709. The reversal of 40387705 is 50778304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12730624 + 27657081 = 3568^2 + 5259^2 .

It is not a de Polignac number, because 40387705 - 2¹ = 40387703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40387703) 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, 4038766 + ... + 4038775.

It is an arithmetic number, because the mean of its divisors is an integer number (12116313).

Almost surely, 2^40387705 is an apocalyptic number.

It is an amenable number.

40387705 is a deficient number, since it is larger than the sum of its proper divisors (8077547).

40387705 is an equidigital number, since it uses as much as digits as its factorization.

40387705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8077546.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 40387705 is about 6355.1321780117. The cubic root of 40387705 is about 343.0965822077.

The spelling of 40387705 in words is "forty million, three hundred eighty-seven thousand, seven hundred five".