1000406399 has 2 divisors, whose sum is σ = 1000406400. Its totient is φ = 1000406398.

The previous prime is 1000406389. The next prime is 1000406431. The reversal of 1000406399 is 9936040001.

It is an a-pointer prime, because the next prime (1000406431) can be obtained adding 1000406399 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000406399 - 2⁴ = 1000406383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000406339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500203199 + 500203200.

It is an arithmetic number, because the mean of its divisors is an integer number (500203200).

Almost surely, 2^1000406399 is an apocalyptic number.

1000406399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000406399 is an equidigital number, since it uses as much as digits as its factorization.

1000406399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 1000406399 is about 31629.2016813577. The cubic root of 1000406399 is about 1000.1354479863.

The spelling of 1000406399 in words is "one billion, four hundred six thousand, three hundred ninety-nine".