820858741 has 4 divisors (see below), whose sum is σ = 833110432. Its totient is φ = 808607052.

The previous prime is 820858733. The next prime is 820858747. The reversal of 820858741 is 147858028.

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 a cyclic number.

It is not a de Polignac number, because 820858741 - 2³ = 820858733 is a prime.

It is a super-2 number, since 2×820858741² = 1347618145352210162, 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 (820858747) 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, 6125745 + ... + 6125878.

It is an arithmetic number, because the mean of its divisors is an integer number (208277608).

Almost surely, 2^820858741 is an apocalyptic number.

It is an amenable number.

820858741 is a deficient number, since it is larger than the sum of its proper divisors (12251691).

820858741 is a wasteful number, since it uses less digits than its factorization.

820858741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12251690.

The product of its (nonzero) digits is 143360, while the sum is 43.

The square root of 820858741 is about 28650.6324712038. The cubic root of 820858741 is about 936.3167853664.

The spelling of 820858741 in words is "eight hundred twenty million, eight hundred fifty-eight thousand, seven hundred forty-one".