40468721 has 8 divisors (see below), whose sum is σ = 42951240. Its totient is φ = 37997568.

The previous prime is 40468693. The next prime is 40468741. The reversal of 40468721 is 12786404.

It can be written as a sum of positive squares in 4 ways, for example, as 31080625 + 9388096 = 5575^2 + 3064^2 .

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 40468721 - 2⁶ = 40468657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40468741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5165 + ... + 10373.

It is an arithmetic number, because the mean of its divisors is an integer number (5368905).

Almost surely, 2^40468721 is an apocalyptic number.

It is an amenable number.

40468721 is a deficient number, since it is larger than the sum of its proper divisors (2482519).

40468721 is a wasteful number, since it uses less digits than its factorization.

40468721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 40468721 is about 6361.5030456646. The cubic root of 40468721 is about 343.3258413128.

The spelling of 40468721 in words is "forty million, four hundred sixty-eight thousand, seven hundred twenty-one".