1989034655 has 4 divisors (see below), whose sum is σ = 2386841592. Its totient is φ = 1591227720.

The previous prime is 1989034643. The next prime is 1989034657. The reversal of 1989034655 is 5564309891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1989034655 - 2²⁴ = 1972257439 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 (1989034657) 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 3 ways as a sum of consecutive naturals, for example, 198903461 + ... + 198903470.

It is an arithmetic number, because the mean of its divisors is an integer number (596710398).

Almost surely, 2^1989034655 is an apocalyptic number.

1989034655 is a deficient number, since it is larger than the sum of its proper divisors (397806937).

1989034655 is an equidigital number, since it uses as much as digits as its factorization.

1989034655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397806936.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 1989034655 is about 44598.5947648578. The cubic root of 1989034655 is about 1257.6142507721.

It can be divided in two parts, 19890 and 34655, that added together give a palindrome (54545).

The spelling of 1989034655 in words is "one billion, nine hundred eighty-nine million, thirty-four thousand, six hundred fifty-five".