40330681 has 4 divisors (see below), whose sum is σ = 42703092. Its totient is φ = 37958272.

The previous prime is 40330679. The next prime is 40330687. The reversal of 40330681 is 18603304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12673600 + 27657081 = 3560^2 + 5259^2 .

It is a cyclic number.

It is not a de Polignac number, because 40330681 - 2¹ = 40330679 is a prime.

It is a super-2 number, since 2×40330681² = 3253127659847522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40330687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186180 + ... + 1186213.

It is an arithmetic number, because the mean of its divisors is an integer number (10675773).

Almost surely, 2^40330681 is an apocalyptic number.

40330681 is the 4017-th centered pentagonal number.

It is an amenable number.

40330681 is a deficient number, since it is larger than the sum of its proper divisors (2372411).

40330681 is a wasteful number, since it uses less digits than its factorization.

40330681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372410.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 40330681 is about 6350.6441405577. The cubic root of 40330681 is about 342.9350317668.

Adding to 40330681 its reverse (18603304), we get a palindrome (58933985).

The spelling of 40330681 in words is "forty million, three hundred thirty thousand, six hundred eighty-one".