40531665 has 16 divisors (see below), whose sum is σ = 64929600. Its totient is φ = 21590592.

The previous prime is 40531619. The next prime is 40531691. The reversal of 40531665 is 56613504.

It is not a de Polignac number, because 40531665 - 2¹⁴ = 40515281 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23451 + ... + 25119.

It is an arithmetic number, because the mean of its divisors is an integer number (4058100).

Almost surely, 2^40531665 is an apocalyptic number.

It is an amenable number.

40531665 is a deficient number, since it is larger than the sum of its proper divisors (24397935).

40531665 is a wasteful number, since it uses less digits than its factorization.

40531665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3296.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 40531665 is about 6366.4483819473. The cubic root of 40531665 is about 343.5037491460.

The spelling of 40531665 in words is "forty million, five hundred thirty-one thousand, six hundred sixty-five".