1918878 has 32 divisors (see below), whose sum is σ = 4202016. Its totient is φ = 580608.

The previous prime is 1918859. The next prime is 1918879. The reversal of 1918878 is 8788191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5526 + ... + 5862.

It is an arithmetic number, because the mean of its divisors is an integer number (131313).

2^1918878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2101008).

1918878 is an abundant number, since it is smaller than the sum of its proper divisors (2283138).

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

1918878 is a wasteful number, since it uses less digits than its factorization.

1918878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428.

The product of its digits is 32256, while the sum is 42.

The square root of 1918878 is about 1385.2357200130. The cubic root of 1918878 is about 124.2650850007.

The spelling of 1918878 in words is "one million, nine hundred eighteen thousand, eight hundred seventy-eight".