1202120989 has 8 divisors (see below), whose sum is σ = 1209296088. Its totient is φ = 1194957120.

The previous prime is 1202120981. The next prime is 1202120993. The reversal of 1202120989 is 9890212021.

It can be written as a sum of positive squares in 4 ways, for example, as 599025625 + 603095364 = 24475^2 + 24558^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1202120989 - 2³ = 1202120981 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 (1202120981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312699 + ... + 316519.

It is an arithmetic number, because the mean of its divisors is an integer number (151162011).

Almost surely, 2^1202120989 is an apocalyptic number.

It is an amenable number.

1202120989 is a deficient number, since it is larger than the sum of its proper divisors (7175099).

1202120989 is a wasteful number, since it uses less digits than its factorization.

1202120989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1202120989 is about 34671.6164751515. The cubic root of 1202120989 is about 1063.2842804410.

The spelling of 1202120989 in words is "one billion, two hundred two million, one hundred twenty thousand, nine hundred eighty-nine".