1984890 has 32 divisors (see below), whose sum is σ = 4815360. Its totient is φ = 523584.

The previous prime is 1984867. The next prime is 1984891. The reversal of 1984890 is 984891.

It is not an unprimeable number, because it can be changed into a prime (1984891) 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, 2967 + ... + 3573.

It is an arithmetic number, because the mean of its divisors is an integer number (150480).

2^1984890 is an apocalyptic number.

1984890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1984890 is an abundant number, since it is smaller than the sum of its proper divisors (2830470).

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

1984890 is a wasteful number, since it uses less digits than its factorization.

1984890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 1984890 is about 1408.8612422804. The cubic root of 1984890 is about 125.6740124587.

Subtracting from 1984890 its reverse (984891), we obtain a palindrome (999999).

The spelling of 1984890 in words is "one million, nine hundred eighty-four thousand, eight hundred ninety".