40729391 has 2 divisors, whose sum is σ = 40729392. Its totient is φ = 40729390.

The previous prime is 40729379. The next prime is 40729397. The reversal of 40729391 is 19392704.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40729391 - 2⁶ = 40729327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40729397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20364695 + 20364696.

It is an arithmetic number, because the mean of its divisors is an integer number (20364696).

Almost surely, 2^40729391 is an apocalyptic number.

40729391 is a deficient number, since it is larger than the sum of its proper divisors (1).

40729391 is an equidigital number, since it uses as much as digits as its factorization.

40729391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 40729391 is about 6381.9582417938. The cubic root of 40729391 is about 344.0614158193.

The spelling of 40729391 in words is "forty million, seven hundred twenty-nine thousand, three hundred ninety-one".