40456729 has 2 divisors, whose sum is σ = 40456730. Its totient is φ = 40456728.

The previous prime is 40456727. The next prime is 40456733. The reversal of 40456729 is 92765404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33085504 + 7371225 = 5752^2 + 2715^2 .

It is a cyclic number.

It is not a de Polignac number, because 40456729 - 2¹ = 40456727 is a prime.

Together with 40456727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40456727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20228364 + 20228365.

It is an arithmetic number, because the mean of its divisors is an integer number (20228365).

Almost surely, 2^40456729 is an apocalyptic number.

It is an amenable number.

40456729 is a deficient number, since it is larger than the sum of its proper divisors (1).

40456729 is an equidigital number, since it uses as much as digits as its factorization.

40456729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 40456729 is about 6360.5604312828. The cubic root of 40456729 is about 343.2919256521.

The spelling of 40456729 in words is "forty million, four hundred fifty-six thousand, seven hundred twenty-nine".