40721305 has 4 divisors (see below), whose sum is σ = 48865572. Its totient is φ = 32577040.

The previous prime is 40721299. The next prime is 40721333. The reversal of 40721305 is 50312704.

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 6568969 + 34152336 = 2563^2 + 5844^2 .

It is not a de Polignac number, because 40721305 - 2³ = 40721297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4072126 + ... + 4072135.

It is an arithmetic number, because the mean of its divisors is an integer number (12216393).

Almost surely, 2^40721305 is an apocalyptic number.

It is an amenable number.

40721305 is a deficient number, since it is larger than the sum of its proper divisors (8144267).

40721305 is an equidigital number, since it uses as much as digits as its factorization.

40721305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8144266.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 40721305 is about 6381.3247057331. The cubic root of 40721305 is about 344.0386454916.

It can be divided in two parts, 407 and 21305, that added together give a palindrome (21712).

The spelling of 40721305 in words is "forty million, seven hundred twenty-one thousand, three hundred five".