40804889 has 2 divisors, whose sum is σ = 40804890. Its totient is φ = 40804888.

The previous prime is 40804861. The next prime is 40804891. The reversal of 40804889 is 98840804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40704400 + 100489 = 6380^2 + 317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40804889 is a prime.

It is a Sophie Germain prime.

Together with 40804891, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p_2479685 and since 40804889 and 2479685 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40804849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20402444 + 20402445.

It is an arithmetic number, because the mean of its divisors is an integer number (20402445).

Almost surely, 2^40804889 is an apocalyptic number.

It is an amenable number.

40804889 is a deficient number, since it is larger than the sum of its proper divisors (1).

40804889 is an equidigital number, since it uses as much as digits as its factorization.

40804889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 40804889 is about 6387.8704589245. The cubic root of 40804889 is about 344.2738743129.

The spelling of 40804889 in words is "forty million, eight hundred four thousand, eight hundred eighty-nine".