811742 has 4 divisors (see below), whose sum is σ = 1217616. Its totient is φ = 405870.

The previous prime is 811729. The next prime is 811747. The reversal of 811742 is 247118.

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 (811747) 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, 202934 + ... + 202937.

It is an arithmetic number, because the mean of its divisors is an integer number (304404).

2⁸¹¹⁷⁴² is an apocalyptic number.

811742 is a deficient number, since it is larger than the sum of its proper divisors (405874).

811742 is a wasteful number, since it uses less digits than its factorization.

811742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405873.

The product of its digits is 448, while the sum is 23.

The square root of 811742 is about 900.9672580066. The cubic root of 811742 is about 93.2837520103.

The spelling of 811742 in words is "eight hundred eleven thousand, seven hundred forty-two".