1620825 has 12 divisors (see below), whose sum is σ = 2679888. Its totient is φ = 864400.

The previous prime is 1620823. The next prime is 1620841. The reversal of 1620825 is 5280261.

It is not a de Polignac number, because 1620825 - 2¹ = 1620823 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

1620825 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1620795 and 1620804.

It is not an unprimeable number, because it can be changed into a prime (1620823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10731 + ... + 10880.

It is an arithmetic number, because the mean of its divisors is an integer number (223324).

2^1620825 is an apocalyptic number.

1620825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620825 is a deficient number, since it is larger than the sum of its proper divisors (1059063).

1620825 is a wasteful number, since it uses less digits than its factorization.

1620825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21624 (or 21619 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1620825 is about 1273.1162554928. The cubic root of 1620825 is about 117.4659626776.

The spelling of 1620825 in words is "one million, six hundred twenty thousand, eight hundred twenty-five".