40313681 has 8 divisors (see below), whose sum is σ = 43200864. Its totient is φ = 37483840.

The previous prime is 40313677. The next prime is 40313723. The reversal of 40313681 is 18631304.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40313681 - 2² = 40313677 is a prime.

It is a super-2 number, since 2×40313681² = 3250385751539522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40313681.

It is not an unprimeable number, because it can be changed into a prime (40313281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12875 + ... + 15696.

It is an arithmetic number, because the mean of its divisors is an integer number (5400108).

Almost surely, 2^40313681 is an apocalyptic number.

It is an amenable number.

40313681 is a deficient number, since it is larger than the sum of its proper divisors (2887183).

40313681 is a wasteful number, since it uses less digits than its factorization.

40313681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28671.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 40313681 is about 6349.3055525782. The cubic root of 40313681 is about 342.8868408716.

Adding to 40313681 its reverse (18631304), we get a palindrome (58944985).

The spelling of 40313681 in words is "forty million, three hundred thirteen thousand, six hundred eighty-one".