40397565 has 32 divisors (see below), whose sum is σ = 69995520. Its totient is φ = 19777536.

The previous prime is 40397563. The next prime is 40397569. The reversal of 40397565 is 56579304.

It is not a de Polignac number, because 40397565 - 2¹ = 40397563 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40397561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43021 + ... + 43949.

It is an arithmetic number, because the mean of its divisors is an integer number (2187360).

Almost surely, 2^40397565 is an apocalyptic number.

It is an amenable number.

40397565 is a deficient number, since it is larger than the sum of its proper divisors (29597955).

40397565 is a wasteful number, since it uses less digits than its factorization.

40397565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 40397565 is about 6355.9078816484. The cubic root of 40397565 is about 343.1245004157.

The spelling of 40397565 in words is "forty million, three hundred ninety-seven thousand, five hundred sixty-five".