1800312 has 16 divisors (see below), whose sum is σ = 4500840. Its totient is φ = 600096.

The previous prime is 1800311. The next prime is 1800313. The reversal of 1800312 is 2130081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1800311) and next prime (1800313).

It is a super-2 number, since 2×1800312² = 6482246594688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1800291 and 1800300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37483 + ... + 37530.

2^1800312 is an apocalyptic number.

1800312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1800312 is an abundant number, since it is smaller than the sum of its proper divisors (2700528).

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

1800312 is a wasteful number, since it uses less digits than its factorization.

1800312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75022 (or 75018 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1800312 is about 1341.7570569965. The cubic root of 1800312 is about 121.6510678277.

Adding to 1800312 its reverse (2130081), we get a palindrome (3930393).

It can be divided in two parts, 1800 and 312, that added together give a palindrome (2112).

The spelling of 1800312 in words is "one million, eight hundred thousand, three hundred twelve".