810142 has 4 divisors (see below), whose sum is σ = 1215216. Its totient is φ = 405070.

The previous prime is 810137. The next prime is 810149. The reversal of 810142 is 241018.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202534 + ... + 202537.

It is an arithmetic number, because the mean of its divisors is an integer number (303804).

2⁸¹⁰¹⁴² is an apocalyptic number.

810142 is a deficient number, since it is larger than the sum of its proper divisors (405074).

810142 is a wasteful number, since it uses less digits than its factorization.

810142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405073.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 810142 is about 900.0788854317. The cubic root of 810142 is about 93.2224221074. Note that the first 3 decimals are identical.

The spelling of 810142 in words is "eight hundred ten thousand, one hundred forty-two".