1800135 has 24 divisors (see below), whose sum is σ = 3157440. Its totient is φ = 948672.

The previous prime is 1800121. The next prime is 1800137. The reversal of 1800135 is 5310081.

It is a happy number.

It is not a de Polignac number, because 1800135 - 2⁴ = 1800119 is a prime.

1800135 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4722 + ... + 5088.

It is an arithmetic number, because the mean of its divisors is an integer number (131560).

2^1800135 is an apocalyptic number.

1800135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1800135 is a deficient number, since it is larger than the sum of its proper divisors (1357305).

1800135 is a wasteful number, since it uses less digits than its factorization.

1800135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1800135 is about 1341.6910970861. The cubic root of 1800135 is about 121.6470809364.

The spelling of 1800135 in words is "one million, eight hundred thousand, one hundred thirty-five".