40785769 has 2 divisors, whose sum is σ = 40785770. Its totient is φ = 40785768.

The previous prime is 40785751. The next prime is 40785791. The reversal of 40785769 is 96758704.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26625600 + 14160169 = 5160^2 + 3763^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40785769 is a prime.

It is a super-2 number, since 2×40785769² = 3326957905842722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40785709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20392884 + 20392885.

It is an arithmetic number, because the mean of its divisors is an integer number (20392885).

Almost surely, 2^40785769 is an apocalyptic number.

It is an amenable number.

40785769 is a deficient number, since it is larger than the sum of its proper divisors (1).

40785769 is an equidigital number, since it uses as much as digits as its factorization.

40785769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 40785769 is about 6386.3736971775. The cubic root of 40785769 is about 344.2200936261.

The spelling of 40785769 in words is "forty million, seven hundred eighty-five thousand, seven hundred sixty-nine".