1898778 has 32 divisors (see below), whose sum is σ = 4427136. Its totient is φ = 531648.

The previous prime is 1898773. The next prime is 1898783. The reversal of 1898778 is 8778981.

It is an interprime number because it is at equal distance from previous prime (1898773) and next prime (1898783).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1898773) 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, 1800 + ... + 2652.

It is an arithmetic number, because the mean of its divisors is an integer number (138348).

2^1898778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1898778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213568).

1898778 is an abundant number, since it is smaller than the sum of its proper divisors (2528358).

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

1898778 is a wasteful number, since it uses less digits than its factorization.

1898778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918.

The product of its digits is 225792, while the sum is 48.

The square root of 1898778 is about 1377.9615379248. The cubic root of 1898778 is about 123.8296742304.

The spelling of 1898778 in words is "one million, eight hundred ninety-eight thousand, seven hundred seventy-eight".