1989534756 has 72 divisors (see below), whose sum is σ = 5143290880. Its totient is φ = 598086720.

The previous prime is 1989534751. The next prime is 1989534761. The reversal of 1989534756 is 6574359891.

It is an interprime number because it is at equal distance from previous prime (1989534751) and next prime (1989534761).

It is a junction number, because it is equal to n+sod(n) for n = 1989534696 and 1989534705.

It is not an unprimeable number, because it can be changed into a prime (1989534751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179010 + ... + 189798.

Almost surely, 2^1989534756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989534756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2571645440).

1989534756 is an abundant number, since it is smaller than the sum of its proper divisors (3153756124).

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

1989534756 is a wasteful number, since it uses less digits than its factorization.

1989534756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10945 (or 10932 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 57.

The square root of 1989534756 is about 44604.2011025867. The cubic root of 1989534756 is about 1257.7196421722.

The spelling of 1989534756 in words is "one billion, nine hundred eighty-nine million, five hundred thirty-four thousand, seven hundred fifty-six".