1620930 has 32 divisors (see below), whose sum is σ = 3950208. Its totient is φ = 425600.

The previous prime is 1620929. The next prime is 1620961. The reversal of 1620930 is 390261.

It is a junction number, because it is equal to n+sod(n) for n = 1620897 and 1620906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1750 + ... + 2510.

It is an arithmetic number, because the mean of its divisors is an integer number (123444).

2^1620930 is an apocalyptic number.

1620930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1975104).

1620930 is an abundant number, since it is smaller than the sum of its proper divisors (2329278).

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

1620930 is a wasteful number, since it uses less digits than its factorization.

1620930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1620930 is about 1273.1574922216. The cubic root of 1620930 is about 117.4684991760.

The spelling of 1620930 in words is "one million, six hundred twenty thousand, nine hundred thirty".