1989061236 has 36 divisors (see below), whose sum is σ = 5030625600. Its totient is φ = 662661648.

The previous prime is 1989061223. The next prime is 1989061247. The reversal of 1989061236 is 6321609891.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 1989061191 and 1989061200.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 57285 + ... + 85203.

It is an arithmetic number, because the mean of its divisors is an integer number (139739600).

Almost surely, 2^1989061236 is an apocalyptic number.

It is an amenable number.

1989061236 is an abundant number, since it is smaller than the sum of its proper divisors (3041564364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989061236 is a wasteful number, since it uses less digits than its factorization.

1989061236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29908 (or 29903 counting only the distinct ones).

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

The square root of 1989061236 is about 44598.8927665250. The cubic root of 1989061236 is about 1257.6198529027.

The spelling of 1989061236 in words is "one billion, nine hundred eighty-nine million, sixty-one thousand, two hundred thirty-six".