40009864 has 8 divisors (see below), whose sum is σ = 75018510. Its totient is φ = 20004928.

The previous prime is 40009843. The next prime is 40009873. The reversal of 40009864 is 46890004.

It can be written as a sum of positive squares in only one way, i.e., 23444964 + 16564900 = 4842^2 + 4070^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500609 + ... + 2500624.

Almost surely, 2^40009864 is an apocalyptic number.

It is an amenable number.

40009864 is a deficient number, since it is larger than the sum of its proper divisors (35008646).

40009864 is a wasteful number, since it uses less digits than its factorization.

40009864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5001239 (or 5001235 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 40009864 is about 6325.3350899379. The cubic root of 40009864 is about 342.0232990294.

Adding to 40009864 its reverse (46890004), we get a palindrome (86899868).

The spelling of 40009864 in words is "forty million, nine thousand, eight hundred sixty-four".