40681015 has 4 divisors (see below), whose sum is σ = 48817224. Its totient is φ = 32544808.

The previous prime is 40681013. The next prime is 40681027. The reversal of 40681015 is 51018604.

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

It is a cyclic number.

It is not a de Polignac number, because 40681015 - 2¹ = 40681013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40681013) 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, 4068097 + ... + 4068106.

It is an arithmetic number, because the mean of its divisors is an integer number (12204306).

Almost surely, 2^40681015 is an apocalyptic number.

40681015 is a deficient number, since it is larger than the sum of its proper divisors (8136209).

40681015 is an equidigital number, since it uses as much as digits as its factorization.

40681015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8136208.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 40681015 is about 6378.1670564512. The cubic root of 40681015 is about 343.9251431448.

Adding to 40681015 its reverse (51018604), we get a palindrome (91699619).

The spelling of 40681015 in words is "forty million, six hundred eighty-one thousand, fifteen".