40393865 has 16 divisors (see below), whose sum is σ = 50865408. Its totient is φ = 30735936.

The previous prime is 40393841. The next prime is 40393877. The reversal of 40393865 is 56839304.

It is a cyclic number.

It is not a de Polignac number, because 40393865 - 2¹⁴ = 40377481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21764 + ... + 23546.

It is an arithmetic number, because the mean of its divisors is an integer number (3179088).

Almost surely, 2^40393865 is an apocalyptic number.

It is an amenable number.

40393865 is a deficient number, since it is larger than the sum of its proper divisors (10471543).

40393865 is a wasteful number, since it uses less digits than its factorization.

40393865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 40393865 is about 6355.6168072029. The cubic root of 40393865 is about 343.1140245416.

The spelling of 40393865 in words is "forty million, three hundred ninety-three thousand, eight hundred sixty-five".