1689630 has 32 divisors (see below), whose sum is σ = 4294944. Its totient is φ = 423936.

The previous prime is 1689617. The next prime is 1689641. The reversal of 1689630 is 369861.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1689591 and 1689600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1147 + ... + 2166.

It is an arithmetic number, because the mean of its divisors is an integer number (134217).

2^1689630 is an apocalyptic number.

1689630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1689630 is an abundant number, since it is smaller than the sum of its proper divisors (2605314).

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

1689630 is a wasteful number, since it uses less digits than its factorization.

1689630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3340.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1689630 is about 1299.8576845178. The cubic root of 1689630 is about 119.1051491590.

The spelling of 1689630 in words is "one million, six hundred eighty-nine thousand, six hundred thirty".