809542 has 8 divisors (see below), whose sum is σ = 1231632. Its totient is φ = 399000.

The previous prime is 809527. The next prime is 809563. The reversal of 809542 is 245908.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 809542.

It is a congruent number.

It is an unprimeable number.

809542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2709 + ... + 2992.

It is an arithmetic number, because the mean of its divisors is an integer number (153954).

2⁸⁰⁹⁵⁴² is an apocalyptic number.

809542 is a deficient number, since it is larger than the sum of its proper divisors (422090).

809542 is a wasteful number, since it uses less digits than its factorization.

809542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5774.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 809542 is about 899.7455195776. The cubic root of 809542 is about 93.1994025762.

The spelling of 809542 in words is "eight hundred nine thousand, five hundred forty-two".