1989520134 has 64 divisors (see below), whose sum is σ = 4793295360. Its totient is φ = 537788160.

The previous prime is 1989520123. The next prime is 1989520157. The reversal of 1989520134 is 4310259891.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 871074 + ... + 873354.

It is an arithmetic number, because the mean of its divisors is an integer number (74895240).

Almost surely, 2^1989520134 is an apocalyptic number.

1989520134 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989520134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2396647680).

1989520134 is an abundant number, since it is smaller than the sum of its proper divisors (2803775226).

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

1989520134 is a wasteful number, since it uses less digits than its factorization.

1989520134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3405.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1989520134 is about 44604.0371939581. The cubic root of 1989520134 is about 1257.7165609792.

The spelling of 1989520134 in words is "one billion, nine hundred eighty-nine million, five hundred twenty thousand, one hundred thirty-four".