1818978 has 48 divisors (see below), whose sum is σ = 4432320. Its totient is φ = 495264.

The previous prime is 1818977. The next prime is 1818979. The reversal of 1818978 is 8798181.

It is an interprime number because it is at equal distance from previous prime (1818977) and next prime (1818979).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818977) 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, 6628 + ... + 6896.

It is an arithmetic number, because the mean of its divisors is an integer number (92340).

2^1818978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1818978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2216160).

1818978 is an abundant number, since it is smaller than the sum of its proper divisors (2613342).

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

1818978 is a wasteful number, since it uses less digits than its factorization.

1818978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 304 counting only the distinct ones).

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

The square root of 1818978 is about 1348.6949247328. The cubic root of 1818978 is about 122.0700574065.

The spelling of 1818978 in words is "one million, eight hundred eighteen thousand, nine hundred seventy-eight".