1620992 has 22 divisors (see below), whose sum is σ = 3242448. Its totient is φ = 809984.

The previous prime is 1620989. The next prime is 1621019. The reversal of 1620992 is 2990261.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 233 + ... + 1815.

It is an arithmetic number, because the mean of its divisors is an integer number (147384).

2^1620992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1621224).

1620992 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1620992 is an equidigital number, since it uses as much as digits as its factorization.

1620992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603 (or 1585 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1620992 is about 1273.1818409010. The cubic root of 1620992 is about 117.4699968664.

The spelling of 1620992 in words is "one million, six hundred twenty thousand, nine hundred ninety-two".