1204390989 has 12 divisors (see below), whose sum is σ = 1751353500. Its totient is φ = 797537664.

The previous prime is 1204390961. The next prime is 1204390991. The reversal of 1204390989 is 9890934021.

1204390989 is a `hidden beast` number, since 120 + 439 + 0 + 98 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 283754025 + 920636964 = 16845^2 + 30342^2 .

It is not a de Polignac number, because 1204390989 - 2²⁸ = 935955533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204390919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 447724 + ... + 450405.

It is an arithmetic number, because the mean of its divisors is an integer number (145946125).

Almost surely, 2^1204390989 is an apocalyptic number.

It is an amenable number.

1204390989 is a deficient number, since it is larger than the sum of its proper divisors (546962511).

1204390989 is a wasteful number, since it uses less digits than its factorization.

1204390989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898284 (or 898281 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1204390989 is about 34704.3367462915. The cubic root of 1204390989 is about 1063.9531364801.

The spelling of 1204390989 in words is "one billion, two hundred four million, three hundred ninety thousand, nine hundred eighty-nine".