40709861 has 2 divisors, whose sum is σ = 40709862. Its totient is φ = 40709860.

The previous prime is 40709831. The next prime is 40709869. The reversal of 40709861 is 16890704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38130625 + 2579236 = 6175^2 + 1606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40709861 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 (40709869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20354930 + 20354931.

It is an arithmetic number, because the mean of its divisors is an integer number (20354931).

Almost surely, 2^40709861 is an apocalyptic number.

It is an amenable number.

40709861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40709861 is an equidigital number, since it uses as much as digits as its factorization.

40709861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 40709861 is about 6380.4279637027. The cubic root of 40709861 is about 344.0064138204.

It can be divided in two parts, 4070 and 9861, that added together give a palindrome (13931).

The spelling of 40709861 in words is "forty million, seven hundred nine thousand, eight hundred sixty-one".