1800139 has 8 divisors (see below), whose sum is σ = 2027520. Its totient is φ = 1583400.

The previous prime is 1800137. The next prime is 1800157. The reversal of 1800139 is 9310081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1800139 - 2¹ = 1800137 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 2299 + ... + 2980.

It is an arithmetic number, because the mean of its divisors is an integer number (253440).

2^1800139 is an apocalyptic number.

1800139 is a deficient number, since it is larger than the sum of its proper divisors (227381).

1800139 is a wasteful number, since it uses less digits than its factorization.

1800139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5321.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1800139 is about 1341.6925877413. The cubic root of 1800139 is about 121.6471710386.

The spelling of 1800139 in words is "one million, eight hundred thousand, one hundred thirty-nine".