1838820 has 48 divisors (see below), whose sum is σ = 5423040. Its totient is φ = 464256.

The previous prime is 1838819. The next prime is 1838843. The reversal of 1838820 is 288381.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334 + ... + 1946.

It is an arithmetic number, because the mean of its divisors is an integer number (112980).

2^1838820 is an apocalyptic number.

1838820 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 1838820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2711520).

1838820 is an abundant number, since it is smaller than the sum of its proper divisors (3584220).

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

1838820 is a wasteful number, since it uses less digits than its factorization.

1838820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 1838820 is about 1356.0309730976. The cubic root of 1838820 is about 122.5123130758.

The spelling of 1838820 in words is "one million, eight hundred thirty-eight thousand, eight hundred twenty".