1204999139 has 2 divisors, whose sum is σ = 1204999140. Its totient is φ = 1204999138.

The previous prime is 1204999129. The next prime is 1204999217. The reversal of 1204999139 is 9319994021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1204999139 - 2¹⁶ = 1204933603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1204999093 and 1204999102.

It is not a weakly prime, because it can be changed into another prime (1204999129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602499569 + 602499570.

It is an arithmetic number, because the mean of its divisors is an integer number (602499570).

Almost surely, 2^1204999139 is an apocalyptic number.

1204999139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204999139 is an equidigital number, since it uses as much as digits as its factorization.

1204999139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 1204999139 is about 34713.0975137627. The cubic root of 1204999139 is about 1064.1321852635.

The spelling of 1204999139 in words is "one billion, two hundred four million, nine hundred ninety-nine thousand, one hundred thirty-nine".