40783661 has 2 divisors, whose sum is σ = 40783662. Its totient is φ = 40783660.

The previous prime is 40783649. The next prime is 40783679. The reversal of 40783661 is 16638704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38365636 + 2418025 = 6194^2 + 1555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40783661 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 (40783261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20391830 + 20391831.

It is an arithmetic number, because the mean of its divisors is an integer number (20391831).

Almost surely, 2^40783661 is an apocalyptic number.

It is an amenable number.

40783661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40783661 is an equidigital number, since it uses as much as digits as its factorization.

40783661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 40783661 is about 6386.2086561590. The cubic root of 40783661 is about 344.2141632205.

The spelling of 40783661 in words is "forty million, seven hundred eighty-three thousand, six hundred sixty-one".