813942 has 16 divisors (see below), whose sum is σ = 1808880. Its totient is φ = 271296.

The previous prime is 813931. The next prime is 813961. The reversal of 813942 is 249318.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813942.

It is an unprimeable number.

813942 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 7 ways as a sum of consecutive naturals, for example, 7483 + ... + 7590.

It is an arithmetic number, because the mean of its divisors is an integer number (113055).

2⁸¹³⁹⁴² is an apocalyptic number.

813942 is an abundant number, since it is smaller than the sum of its proper divisors (994938).

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

813942 is a wasteful number, since it uses less digits than its factorization.

813942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15084 (or 15078 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 813942 is about 902.1873419640. The cubic root of 813942 is about 93.3679491781.

The spelling of 813942 in words is "eight hundred thirteen thousand, nine hundred forty-two".