813938 has 4 divisors (see below), whose sum is σ = 1220910. Its totient is φ = 406968.

The previous prime is 813931. The next prime is 813961. The reversal of 813938 is 839318.

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

It can be written as a sum of positive squares in only one way, i.e., 744769 + 69169 = 863^2 + 263^2 .

It is a Curzon number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (813931) by changing a digit.

813938 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 203483 + ... + 203486.

2⁸¹³⁹³⁸ is an apocalyptic number.

813938 is a deficient number, since it is larger than the sum of its proper divisors (406972).

813938 is a wasteful number, since it uses less digits than its factorization.

813938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406971.

The product of its digits is 5184, while the sum is 32.

The square root of 813938 is about 902.1851251268. The cubic root of 813938 is about 93.3677962301.

The spelling of 813938 in words is "eight hundred thirteen thousand, nine hundred thirty-eight".