1204678999 has 2 divisors, whose sum is σ = 1204679000. Its totient is φ = 1204678998.

The previous prime is 1204678897. The next prime is 1204679017. The reversal of 1204678999 is 9998764021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1204678999 - 2²⁹ = 667808087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1204673999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602339499 + 602339500.

It is an arithmetic number, because the mean of its divisors is an integer number (602339500).

Almost surely, 2^1204678999 is an apocalyptic number.

1204678999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204678999 is an equidigital number, since it uses as much as digits as its factorization.

1204678999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The square root of 1204678999 is about 34708.4859796563. The cubic root of 1204678999 is about 1064.0379385981.

The spelling of 1204678999 in words is "one billion, two hundred four million, six hundred seventy-eight thousand, nine hundred ninety-nine".