818938973 has 4 divisors (see below), whose sum is σ = 820731420. Its totient is φ = 817146528.

The previous prime is 818938963. The next prime is 818938979. The reversal of 818938973 is 379839818.

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

It can be written as a sum of positive squares in 2 ways, for example, as 268238884 + 550700089 = 16378^2 + 23467^2 .

It is a cyclic number.

It is not a de Polignac number, because 818938973 - 2⁴ = 818938957 is a prime.

It is a super-2 number, since 2×818938973² = 1341322082996589458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818938979) 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 in 3 ways as a sum of consecutive naturals, for example, 895538 + ... + 896451.

It is an arithmetic number, because the mean of its divisors is an integer number (205182855).

Almost surely, 2^818938973 is an apocalyptic number.

It is an amenable number.

818938973 is a deficient number, since it is larger than the sum of its proper divisors (1792447).

818938973 is a wasteful number, since it uses less digits than its factorization.

818938973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792446.

The product of its digits is 2612736, while the sum is 56.

The square root of 818938973 is about 28617.1097946665. The cubic root of 818938973 is about 935.5862844757.

The spelling of 818938973 in words is "eight hundred eighteen million, nine hundred thirty-eight thousand, nine hundred seventy-three".