40289999 has 2 divisors, whose sum is σ = 40290000. Its totient is φ = 40289998.

The previous prime is 40289993. The next prime is 40290023. The reversal of 40289999 is 99998204.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40289999 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

40289999 is a modest number, since divided by 9999 gives 4028 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40289993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20144999 + 20145000.

It is an arithmetic number, because the mean of its divisors is an integer number (20145000).

Almost surely, 2^40289999 is an apocalyptic number.

40289999 is a deficient number, since it is larger than the sum of its proper divisors (1).

40289999 is an equidigital number, since it uses as much as digits as its factorization.

40289999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 40289999 is about 6347.4403502514. The cubic root of 40289999 is about 342.8196855326.

The spelling of 40289999 in words is "forty million, two hundred eighty-nine thousand, nine hundred ninety-nine".