820713406 has 8 divisors (see below), whose sum is σ = 1270782144. Its totient is φ = 397119360.

The previous prime is 820713401. The next prime is 820713409. The reversal of 820713406 is 604317028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820713401) 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, 6618595 + ... + 6618718.

It is an arithmetic number, because the mean of its divisors is an integer number (158847768).

Almost surely, 2^820713406 is an apocalyptic number.

820713406 is a deficient number, since it is larger than the sum of its proper divisors (450068738).

820713406 is a wasteful number, since it uses less digits than its factorization.

820713406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13237346.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 820713406 is about 28648.0960274850. The cubic root of 820713406 is about 936.2615230640.

The spelling of 820713406 in words is "eight hundred twenty million, seven hundred thirteen thousand, four hundred six".