1200209989 has 16 divisors (see below), whose sum is σ = 1372783104. Its totient is φ = 1038668400.

The previous prime is 1200209987. The next prime is 1200210041. The reversal of 1200209989 is 9899020021.

It is not a de Polignac number, because 1200209989 - 2¹ = 1200209987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200209987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42142 + ... + 64624.

It is an arithmetic number, because the mean of its divisors is an integer number (85798944).

Almost surely, 2^1200209989 is an apocalyptic number.

It is an amenable number.

1200209989 is a deficient number, since it is larger than the sum of its proper divisors (172573115).

1200209989 is a wasteful number, since it uses less digits than its factorization.

1200209989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22728.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1200209989 is about 34644.0469489348. The cubic root of 1200209989 is about 1062.7205507369.

The spelling of 1200209989 in words is "one billion, two hundred million, two hundred nine thousand, nine hundred eighty-nine".