40005665 has 8 divisors (see below), whose sum is σ = 54864960. Its totient is φ = 27432432.

The previous prime is 40005661. The next prime is 40005673. The reversal of 40005665 is 56650004.

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 40005665 - 2² = 40005661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40005661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571475 + ... + 571544.

It is an arithmetic number, because the mean of its divisors is an integer number (6858120).

Almost surely, 2^40005665 is an apocalyptic number.

It is an amenable number.

40005665 is a deficient number, since it is larger than the sum of its proper divisors (14859295).

40005665 is a wasteful number, since it uses less digits than its factorization.

40005665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143031.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 40005665 is about 6325.0031620545. The cubic root of 40005665 is about 342.0113335961.

Adding to 40005665 its reverse (56650004), we get a palindrome (96655669).

The spelling of 40005665 in words is "forty million, five thousand, six hundred sixty-five".