1200039989 has 4 divisors (see below), whose sum is σ = 1211255424. Its totient is φ = 1188824556.

The previous prime is 1200039983. The next prime is 1200039991. The reversal of 1200039989 is 9899300021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200039989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200039983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5607557 + ... + 5607770.

It is an arithmetic number, because the mean of its divisors is an integer number (302813856).

Almost surely, 2^1200039989 is an apocalyptic number.

It is an amenable number.

1200039989 is a deficient number, since it is larger than the sum of its proper divisors (11215435).

1200039989 is a wasteful number, since it uses less digits than its factorization.

1200039989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11215434.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1200039989 is about 34641.5933380669. The cubic root of 1200039989 is about 1062.6703731219.

The spelling of 1200039989 in words is "one billion, two hundred million, thirty-nine thousand, nine hundred eighty-nine".