1621968 has 20 divisors (see below), whose sum is σ = 4190208. Its totient is φ = 540640.

The previous prime is 1621933. The next prime is 1621979. The reversal of 1621968 is 8691261.

It is a congruent 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, 16848 + ... + 16943.

2^1621968 is an apocalyptic number.

It is an amenable number.

1621968 is an abundant number, since it is smaller than the sum of its proper divisors (2568240).

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

1621968 is a wasteful number, since it uses less digits than its factorization.

1621968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33802 (or 33796 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 1621968 is about 1273.5650748980. The cubic root of 1621968 is about 117.4935683819.

The spelling of 1621968 in words is "one million, six hundred twenty-one thousand, nine hundred sixty-eight".