820674237 has 4 divisors (see below), whose sum is σ = 1094232320. Its totient is φ = 547116156.

The previous prime is 820674229. The next prime is 820674241. The reversal of 820674237 is 732476028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 820674237 - 2³ = 820674229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820674195 and 820674204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820674287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136779037 + ... + 136779042.

It is an arithmetic number, because the mean of its divisors is an integer number (273558080).

Almost surely, 2^820674237 is an apocalyptic number.

It is an amenable number.

820674237 is a deficient number, since it is larger than the sum of its proper divisors (273558083).

820674237 is a wasteful number, since it uses less digits than its factorization.

820674237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273558082.

The product of its (nonzero) digits is 112896, while the sum is 39.

The square root of 820674237 is about 28647.4123962357. The cubic root of 820674237 is about 936.2466282945.

The spelling of 820674237 in words is "eight hundred twenty million, six hundred seventy-four thousand, two hundred thirty-seven".