1620804 has 24 divisors (see below), whose sum is σ = 3904768. Its totient is φ = 522720.

The previous prime is 1620803. The next prime is 1620811. The reversal of 1620804 is 4080261.

It is not an unprimeable number, because it can be changed into a prime (1620803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1807 + ... + 2550.

2^1620804 is an apocalyptic number.

It is an amenable number.

1620804 is an abundant number, since it is smaller than the sum of its proper divisors (2283964).

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

1620804 is a wasteful number, since it uses less digits than its factorization.

1620804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4395 (or 4393 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1620804 is about 1273.1080079868. The cubic root of 1620804 is about 117.4654553648.

The spelling of 1620804 in words is "one million, six hundred twenty thousand, eight hundred four".