406821189620 has 12 divisors (see below), whose sum is σ = 854324498244. Its totient is φ = 162728475840.

The previous prime is 406821189601. The next prime is 406821189623. The reversal of 406821189620 is 26981128604.

It can be written as a sum of positive squares in 2 ways, for example, as 42751351696 + 364069837924 = 206764^2 + 603382^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406821189623) 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, 10170529721 + ... + 10170529760.

It is an arithmetic number, because the mean of its divisors is an integer number (71193708187).

Almost surely, 2^406821189620 is an apocalyptic number.

It is an amenable number.

406821189620 is an abundant number, since it is smaller than the sum of its proper divisors (447503308624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

406821189620 is a wasteful number, since it uses less digits than its factorization.

406821189620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20341059490 (or 20341059488 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 406821189620 in words is "four hundred six billion, eight hundred twenty-one million, one hundred eighty-nine thousand, six hundred twenty".