1800450 has 36 divisors (see below), whose sum is σ = 4838418. Its totient is φ = 480000.

The previous prime is 1800431. The next prime is 1800451. The reversal of 1800450 is 540081.

It can be written as a sum of positive squares in 3 ways, for example, as 826281 + 974169 = 909^2 + 987^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800451) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1551 + ... + 2450.

2^1800450 is an apocalyptic number.

1800450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1800450 is an abundant number, since it is smaller than the sum of its proper divisors (3037968).

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

1800450 is a wasteful number, since it uses less digits than its factorization.

1800450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4019 (or 4011 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1800450 is about 1341.8084811179. The cubic root of 1800450 is about 121.6541760702.

It can be divided in two parts, 1800 and 450, that multiplied together give a 4-th power (810000 = 30⁴).

The spelling of 1800450 in words is "one million, eight hundred thousand, four hundred fifty".