1806624 has 120 divisors (see below), whose sum is σ = 5762988. Its totient is φ = 552960.

The previous prime is 1806617. The next prime is 1806631. The reversal of 1806624 is 4266081.

It is an interprime number because it is at equal distance from previous prime (1806617) and next prime (1806631).

It can be written as a sum of positive squares in 2 ways, for example, as 1774224 + 32400 = 1332^2 + 180^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44044 + ... + 44084.

2^1806624 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 1806624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2881494).

1806624 is an abundant number, since it is smaller than the sum of its proper divisors (3956364).

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

1806624 is a wasteful number, since it uses less digits than its factorization.

1806624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1806624 is about 1344.1071385868. The cubic root of 1806624 is about 121.7930739346.

The spelling of 1806624 in words is "one million, eight hundred six thousand, six hundred twenty-four".