40287709 has 32 divisors (see below), whose sum is σ = 52531200. Its totient is φ = 29989440.

The previous prime is 40287701. The next prime is 40287713. The reversal of 40287709 is 90778204.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40287709 - 2³ = 40287701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40287701) 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 31 ways as a sum of consecutive naturals, for example, 224982 + ... + 225160.

It is an arithmetic number, because the mean of its divisors is an integer number (1641600).

Almost surely, 2^40287709 is an apocalyptic number.

It is an amenable number.

40287709 is a deficient number, since it is larger than the sum of its proper divisors (12243491).

40287709 is a wasteful number, since it uses less digits than its factorization.

40287709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 40287709 is about 6347.2599600142. The cubic root of 40287709 is about 342.8131903562.

The spelling of 40287709 in words is "forty million, two hundred eighty-seven thousand, seven hundred nine".