1671620 has 48 divisors (see below), whose sum is σ = 3810240. Its totient is φ = 614016.

The previous prime is 1671619. The next prime is 1671629. The reversal of 1671620 is 261761.

It is not an unprimeable number, because it can be changed into a prime (1671629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20099 + ... + 20181.

It is an arithmetic number, because the mean of its divisors is an integer number (79380).

2^1671620 is an apocalyptic number.

1671620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1671620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905120).

1671620 is an abundant number, since it is smaller than the sum of its proper divisors (2138620).

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

1671620 is a wasteful number, since it uses less digits than its factorization.

1671620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1671620 is about 1292.9114432164. The cubic root of 1671620 is about 118.6804505023.

The spelling of 1671620 in words is "one million, six hundred seventy-one thousand, six hundred twenty".