1818864 has 60 divisors (see below), whose sum is σ = 5396976. Its totient is φ = 569856.

The previous prime is 1818833. The next prime is 1818871. The reversal of 1818864 is 4688181.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2077 + ... + 2819.

2^1818864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1818864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2698488).

1818864 is an abundant number, since it is smaller than the sum of its proper divisors (3578112).

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

1818864 is a wasteful number, since it uses less digits than its factorization.

1818864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 765 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 1818864 is about 1348.6526609917. The cubic root of 1818864 is about 122.0675072057.

It can be divided in two parts, 181 and 8864, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 1818864 in words is "one million, eight hundred eighteen thousand, eight hundred sixty-four".