1985669532 has 288 divisors, whose sum is σ = 6613824000. Its totient is φ = 514594080.

The previous prime is 1985669473. The next prime is 1985669551. The reversal of 1985669532 is 2359665891.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4482103 + ... + 4482545.

Almost surely, 2^1985669532 is an apocalyptic number.

1985669532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1985669532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3306912000).

1985669532 is an abundant number, since it is smaller than the sum of its proper divisors (4628154468).

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

1985669532 is a wasteful number, since it uses less digits than its factorization.

1985669532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 466 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The square root of 1985669532 is about 44560.8520116032. The cubic root of 1985669532 is about 1256.9046242021.

The spelling of 1985669532 in words is "one billion, nine hundred eighty-five million, six hundred sixty-nine thousand, five hundred thirty-two".