40099729 has 2 divisors, whose sum is σ = 40099730. Its totient is φ = 40099728.

The previous prime is 40099699. The next prime is 40099733. The reversal of 40099729 is 92799004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28890625 + 11209104 = 5375^2 + 3348^2 .

It is a cyclic number.

It is not a de Polignac number, because 40099729 - 2¹⁹ = 39575441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40099691 and 40099700.

It is not a weakly prime, because it can be changed into another prime (40099799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20049864 + 20049865.

It is an arithmetic number, because the mean of its divisors is an integer number (20049865).

Almost surely, 2^40099729 is an apocalyptic number.

It is an amenable number.

40099729 is a deficient number, since it is larger than the sum of its proper divisors (1).

40099729 is an equidigital number, since it uses as much as digits as its factorization.

40099729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 40099729 is about 6332.4346818582. The cubic root of 40099729 is about 342.2791771028.

The spelling of 40099729 in words is "forty million, ninety-nine thousand, seven hundred twenty-nine".