40709869 has 2 divisors, whose sum is σ = 40709870. Its totient is φ = 40709868.

The previous prime is 40709861. The next prime is 40709897. The reversal of 40709869 is 96890704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33756100 + 6953769 = 5810^2 + 2637^2 .

It is a cyclic number.

It is not a de Polignac number, because 40709869 - 2³ = 40709861 is a prime.

It is a super-2 number, since 2×40709869² = 3314586867994322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40709861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20354934 + 20354935.

It is an arithmetic number, because the mean of its divisors is an integer number (20354935).

Almost surely, 2^40709869 is an apocalyptic number.

It is an amenable number.

40709869 is a deficient number, since it is larger than the sum of its proper divisors (1).

40709869 is an equidigital number, since it uses as much as digits as its factorization.

40709869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 40709869 is about 6380.4285906199. The cubic root of 40709869 is about 344.0064363542.

The spelling of 40709869 in words is "forty million, seven hundred nine thousand, eight hundred sixty-nine".