40665861 has 16 divisors (see below), whose sum is σ = 60374400. Its totient is φ = 27052704.

The previous prime is 40665841. The next prime is 40665869. The reversal of 40665861 is 16856604.

It is not a de Polignac number, because 40665861 - 2⁶ = 40665797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40665869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14040 + ... + 16686.

It is an arithmetic number, because the mean of its divisors is an integer number (3773400).

Almost surely, 2^40665861 is an apocalyptic number.

It is an amenable number.

40665861 is a deficient number, since it is larger than the sum of its proper divisors (19708539).

40665861 is a wasteful number, since it uses less digits than its factorization.

40665861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3225 (or 3219 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 40665861 is about 6376.9789869499. The cubic root of 40665861 is about 343.8824328953.

The spelling of 40665861 in words is "forty million, six hundred sixty-five thousand, eight hundred sixty-one".