40649743 has 2 divisors, whose sum is σ = 40649744. Its totient is φ = 40649742.

The previous prime is 40649723. The next prime is 40649747. The reversal of 40649743 is 34794604.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40649743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40649747) 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, 20324871 + 20324872.

It is an arithmetic number, because the mean of its divisors is an integer number (20324872).

Almost surely, 2^40649743 is an apocalyptic number.

40649743 is a deficient number, since it is larger than the sum of its proper divisors (1).

40649743 is an equidigital number, since it uses as much as digits as its factorization.

40649743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 40649743 is about 6375.7150971479. The cubic root of 40649743 is about 343.8369940484.

The spelling of 40649743 in words is "forty million, six hundred forty-nine thousand, seven hundred forty-three".