40869889 has 2 divisors, whose sum is σ = 40869890. Its totient is φ = 40869888.

The previous prime is 40869869. The next prime is 40869901. The reversal of 40869889 is 98896804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36204289 + 4665600 = 6017^2 + 2160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40869889 is a prime.

It is not a weakly prime, because it can be changed into another prime (40869809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20434944 + 20434945.

It is an arithmetic number, because the mean of its divisors is an integer number (20434945).

It is a Proth number, since it is equal to 4989 ⋅ 2¹³ + 1 and 4989 < 2¹³.

Almost surely, 2^40869889 is an apocalyptic number.

It is an amenable number.

40869889 is a deficient number, since it is larger than the sum of its proper divisors (1).

40869889 is an equidigital number, since it uses as much as digits as its factorization.

40869889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 52.

The square root of 40869889 is about 6392.9562019460. The cubic root of 40869889 is about 344.4565806068.

The spelling of 40869889 in words is "forty million, eight hundred sixty-nine thousand, eight hundred eighty-nine".