820274407 has 4 divisors (see below), whose sum is σ = 839350600. Its totient is φ = 801198216.

The previous prime is 820274393. The next prime is 820274417. The reversal of 820274407 is 704472028.

820274407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 820274407 - 2¹¹ = 820272359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820274417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9538032 + ... + 9538117.

It is an arithmetic number, because the mean of its divisors is an integer number (209837650).

Almost surely, 2^820274407 is an apocalyptic number.

820274407 is a deficient number, since it is larger than the sum of its proper divisors (19076193).

820274407 is a wasteful number, since it uses less digits than its factorization.

820274407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19076192.

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 820274407 is about 28640.4330798261. The cubic root of 820274407 is about 936.0945580896.

The spelling of 820274407 in words is "eight hundred twenty million, two hundred seventy-four thousand, four hundred seven".