1918938 has 48 divisors (see below), whose sum is σ = 4580064. Its totient is φ = 534240.

The previous prime is 1918933. The next prime is 1918967. The reversal of 1918938 is 8398191.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1918896 and 1918905.

It is not an unprimeable number, because it can be changed into a prime (1918933) 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 23 ways as a sum of consecutive naturals, for example, 17881 + ... + 17987.

It is an arithmetic number, because the mean of its divisors is an integer number (95418).

2^1918938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2290032).

1918938 is an abundant number, since it is smaller than the sum of its proper divisors (2661126).

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

1918938 is a wasteful number, since it uses less digits than its factorization.

1918938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 180 counting only the distinct ones).

The product of its digits is 15552, while the sum is 39.

The square root of 1918938 is about 1385.2573768076. The cubic root of 1918938 is about 124.2663801720.

The spelling of 1918938 in words is "one million, nine hundred eighteen thousand, nine hundred thirty-eight".