40753721 has 2 divisors, whose sum is σ = 40753722. Its totient is φ = 40753720.

The previous prime is 40753717. The next prime is 40753753. The reversal of 40753721 is 12735704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35046400 + 5707321 = 5920^2 + 2389^2 .

It is a cyclic number.

It is not a de Polignac number, because 40753721 - 2² = 40753717 is a prime.

It is not a weakly prime, because it can be changed into another prime (40753421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20376860 + 20376861.

It is an arithmetic number, because the mean of its divisors is an integer number (20376861).

Almost surely, 2^40753721 is an apocalyptic number.

It is an amenable number.

40753721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40753721 is an equidigital number, since it uses as much as digits as its factorization.

40753721 is an odious number, because the sum of its binary digits is odd.

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

The square root of 40753721 is about 6383.8641119623. The cubic root of 40753721 is about 344.1299113845.

The spelling of 40753721 in words is "forty million, seven hundred fifty-three thousand, seven hundred twenty-one".