1656630 has 48 divisors (see below), whose sum is σ = 4380480. Its totient is φ = 434304.

The previous prime is 1656617. The next prime is 1656631. The reversal of 1656630 is 366561.

1656630 is a `hidden beast` number, since 1 + 656 + 6 + 3 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1656594 and 1656603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6994 + ... + 7226.

It is an arithmetic number, because the mean of its divisors is an integer number (91260).

2^1656630 is an apocalyptic number.

1656630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1656630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2190240).

1656630 is an abundant number, since it is smaller than the sum of its proper divisors (2723850).

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

1656630 is a wasteful number, since it uses less digits than its factorization.

1656630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1656630 is about 1287.1013946073. The cubic root of 1656630 is about 118.3246351252.

The spelling of 1656630 in words is "one million, six hundred fifty-six thousand, six hundred thirty".