813642 has 8 divisors (see below), whose sum is σ = 1627296. Its totient is φ = 271212.

The previous prime is 813623. The next prime is 813647. The reversal of 813642 is 246318.

It is a happy number.

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

813642 is an admirable number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813642.

It is not an unprimeable number, because it can be changed into a prime (813647) by changing a digit.

813642 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, 67798 + ... + 67809.

It is an arithmetic number, because the mean of its divisors is an integer number (203412).

2⁸¹³⁶⁴² is an apocalyptic number.

813642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813642 is a wasteful number, since it uses less digits than its factorization.

813642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135612.

The product of its digits is 1152, while the sum is 24.

The square root of 813642 is about 902.0210640556. The cubic root of 813642 is about 93.3564766871.

The spelling of 813642 in words is "eight hundred thirteen thousand, six hundred forty-two".