1800811142 has 32 divisors (see below), whose sum is σ = 3007549440. Its totient is φ = 803072160.

The previous prime is 1800811141. The next prime is 1800811153. The reversal of 1800811142 is 2411180081.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800811141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674903 + ... + 677565.

It is an arithmetic number, because the mean of its divisors is an integer number (93985920).

Almost surely, 2^1800811142 is an apocalyptic number.

1800811142 is a deficient number, since it is larger than the sum of its proper divisors (1206738298).

1800811142 is a wasteful number, since it uses less digits than its factorization.

1800811142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548.

The product of its (nonzero) digits is 512, while the sum is 26.

The square root of 1800811142 is about 42435.9651946318. The cubic root of 1800811142 is about 1216.6230949889.

The spelling of 1800811142 in words is "one billion, eight hundred million, eight hundred eleven thousand, one hundred forty-two".