1689471900 has 216 divisors, whose sum is σ = 5852062944. Its totient is φ = 405504000.

The previous prime is 1689471893. The next prime is 1689471913. The reversal of 1689471900 is 91749861.

It is a happy number.

1689471900 is a `hidden beast` number, since 16 + 89 + 471 + 90 + 0 = 666.

1689471900 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1689471900² = 5708630601779220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 349500 + ... + 354300.

It is an arithmetic number, because the mean of its divisors is an integer number (27092884).

Almost surely, 2^1689471900 is an apocalyptic number.

1689471900 is a gapful number since it is divisible by the number (10) 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 1689471900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2926031472).

1689471900 is an abundant number, since it is smaller than the sum of its proper divisors (4162591044).

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

1689471900 is a wasteful number, since it uses less digits than its factorization.

1689471900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4861 (or 4851 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 1689471900 is about 41103.1860078997. The cubic root of 1689471900 is about 1191.0143412249.

The spelling of 1689471900 in words is "one billion, six hundred eighty-nine million, four hundred seventy-one thousand, nine hundred".