1656920 has 32 divisors (see below), whose sum is σ = 3892320. Its totient is φ = 633600.

The previous prime is 1656917. The next prime is 1656931. The reversal of 1656920 is 296561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20 + ... + 1820.

It is an arithmetic number, because the mean of its divisors is an integer number (121635).

2^1656920 is an apocalyptic number.

1656920 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 1656920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1946160).

1656920 is an abundant number, since it is smaller than the sum of its proper divisors (2235400).

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

1656920 is a wasteful number, since it uses less digits than its factorization.

1656920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835 (or 1831 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1656920 is about 1287.2140459147. The cubic root of 1656920 is about 118.3315391295.

The spelling of 1656920 in words is "one million, six hundred fifty-six thousand, nine hundred twenty".