40729709 has 2 divisors, whose sum is σ = 40729710. Its totient is φ = 40729708.

The previous prime is 40729681. The next prime is 40729721. The reversal of 40729709 is 90792704.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36120100 + 4609609 = 6010^2 + 2147^2 .

It is a cyclic number.

It is not a de Polignac number, because 40729709 - 2⁸ = 40729453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40729309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20364854 + 20364855.

It is an arithmetic number, because the mean of its divisors is an integer number (20364855).

Almost surely, 2^40729709 is an apocalyptic number.

It is an amenable number.

40729709 is a deficient number, since it is larger than the sum of its proper divisors (1).

40729709 is an equidigital number, since it uses as much as digits as its factorization.

40729709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 40729709 is about 6381.9831557283. The cubic root of 40729709 is about 344.0623112516.

The spelling of 40729709 in words is "forty million, seven hundred twenty-nine thousand, seven hundred nine".