1801020 has 48 divisors (see below), whose sum is σ = 5433120. Its totient is φ = 443136.

The previous prime is 1801013. The next prime is 1801021. The reversal of 1801020 is 201081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1800987 and 1801005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801021) 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, 375 + ... + 1934.

It is an arithmetic number, because the mean of its divisors is an integer number (113190).

2^1801020 is an apocalyptic number.

1801020 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 1801020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2716560).

1801020 is an abundant number, since it is smaller than the sum of its proper divisors (3632100).

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

1801020 is a wasteful number, since it uses less digits than its factorization.

1801020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334 (or 2332 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1801020 is about 1342.0208642193. The cubic root of 1801020 is about 121.6670127802.

The spelling of 1801020 in words is "one million, eight hundred one thousand, twenty".