1890018 has 48 divisors (see below), whose sum is σ = 4540536. Its totient is φ = 564480.

The previous prime is 1889999. The next prime is 1890019. The reversal of 1890018 is 8100981.

It can be written as a sum of positive squares in 4 ways, for example, as 1375929 + 514089 = 1173^2 + 717^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1889973 and 1890000.

It is not an unprimeable number, because it can be changed into a prime (1890019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9496 + ... + 9692.

2^1890018 is an apocalyptic number.

1890018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1890018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2270268).

1890018 is an abundant number, since it is smaller than the sum of its proper divisors (2650518).

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

1890018 is a wasteful number, since it uses less digits than its factorization.

1890018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1890018 is about 1374.7792550079. The cubic root of 1890018 is about 123.6389514964.

Adding to 1890018 its reverse (8100981), we get a palindrome (9990999).

The spelling of 1890018 in words is "one million, eight hundred ninety thousand, eighteen".