40681597 has 4 divisors (see below), whose sum is σ = 44379936. Its totient is φ = 36983260.

The previous prime is 40681591. The next prime is 40681637. The reversal of 40681597 is 79518604.

40681597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40681597 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40681591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1849153 + ... + 1849174.

It is an arithmetic number, because the mean of its divisors is an integer number (11094984).

Almost surely, 2^40681597 is an apocalyptic number.

It is an amenable number.

40681597 is a deficient number, since it is larger than the sum of its proper divisors (3698339).

40681597 is a wasteful number, since it uses less digits than its factorization.

40681597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698338.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 40681597 is about 6378.2126806810. The cubic root of 40681597 is about 343.9267832504.

It can be divided in two parts, 4068 and 1597, that added together give a palindrome (5665).

The spelling of 40681597 in words is "forty million, six hundred eighty-one thousand, five hundred ninety-seven".