1620896 has 24 divisors (see below), whose sum is σ = 3279780. Its totient is φ = 788544.

The previous prime is 1620893. The next prime is 1620917. The reversal of 1620896 is 6980261.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 1488400 + 132496 = 1220^2 + 364^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (1620893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43790 + ... + 43826.

2^1620896 is an apocalyptic number.

1620896 is a gapful number since it is divisible by the number (16) 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 1620896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639890).

1620896 is an abundant number, since it is smaller than the sum of its proper divisors (1658884).

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

1620896 is an frugal number, since it uses more digits than its factorization.

1620896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1620896 is about 1273.1441395223. The cubic root of 1620896 is about 117.4676778456.

1620896 divided by its sum of digits (32) gives a cube (50653 = 37³).

The spelling of 1620896 in words is "one million, six hundred twenty thousand, eight hundred ninety-six".