1800004 has 6 divisors (see below), whose sum is σ = 3150014. Its totient is φ = 900000.

The previous prime is 1799999. The next prime is 1800017. The reversal of 1800004 is 4000081.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 161604 = 1280^2 + 402^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224997 + ... + 225004.

2^1800004 is an apocalyptic number.

It is an amenable number.

1800004 is a deficient number, since it is larger than the sum of its proper divisors (1350010).

1800004 is a wasteful number, since it uses less digits than its factorization.

1800004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450005 (or 450003 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1800004 is about 1341.6422772110. The cubic root of 1800004 is about 121.6441300181.

Adding to 1800004 its reverse (4000081), we get a palindrome (5800085).

The spelling of 1800004 in words is "one million, eight hundred thousand, four".