1621056 has 28 divisors (see below), whose sum is σ = 4289552. Its totient is φ = 540288.

The previous prime is 1621049. The next prime is 1621079. The reversal of 1621056 is 6501261.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4030 + ... + 4413.

2^1621056 is an apocalyptic number.

1621056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1621056 is an abundant number, since it is smaller than the sum of its proper divisors (2668496).

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

1621056 is an equidigital number, since it uses as much as digits as its factorization.

1621056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8458 (or 8448 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1621056 is about 1273.2069745332. The cubic root of 1621056 is about 117.4715428294.

The spelling of 1621056 in words is "one million, six hundred twenty-one thousand, fifty-six".