1800002 has 4 divisors (see below), whose sum is σ = 2700006. Its totient is φ = 900000.

The previous prime is 1799999. The next prime is 1800017. The reversal of 1800002 is 2000081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 502681 = 1139^2 + 709^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449999 + ... + 450002.

2^1800002 is an apocalyptic number.

1800002 is a deficient number, since it is larger than the sum of its proper divisors (900004).

1800002 is an equidigital number, since it uses as much as digits as its factorization.

1800002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900003.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1800002 is about 1341.6415318557. The cubic root of 1800002 is about 121.6440849648.

Adding to 1800002 its reverse (2000081), we get a palindrome (3800083).

It can be divided in two parts, 180000 and 2, that multiplied together give a square (360000 = 600²).

The spelling of 1800002 in words is "one million, eight hundred thousand, two".