40735721 has 8 divisors (see below), whose sum is σ = 43929480. Its totient is φ = 37550592.

The previous prime is 40735697. The next prime is 40735729. The reversal of 40735721 is 12753704.

It can be written as a sum of positive squares in 4 ways, for example, as 1860496 + 38875225 = 1364^2 + 6235^2 .

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 40735721 - 2⁶ = 40735657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40735729) 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, 10391 + ... + 13763.

It is an arithmetic number, because the mean of its divisors is an integer number (5491185).

Almost surely, 2^40735721 is an apocalyptic number.

It is an amenable number.

40735721 is a deficient number, since it is larger than the sum of its proper divisors (3193759).

40735721 is a wasteful number, since it uses less digits than its factorization.

40735721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 40735721 is about 6382.4541518134. The cubic root of 40735721 is about 344.0792391150.

The spelling of 40735721 in words is "forty million, seven hundred thirty-five thousand, seven hundred twenty-one".