3405721836 has 48 divisors (see below), whose sum is σ = 8968055040. Its totient is φ = 996448320.

The previous prime is 3405721829. The next prime is 3405721873. The reversal of 3405721836 is 6381275043.

It is a junction number, because it is equal to n+sod(n) for n = 3405721794 and 3405721803.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 441016 + ... + 448671.

It is an arithmetic number, because the mean of its divisors is an integer number (186834480).

Almost surely, 2^3405721836 is an apocalyptic number.

It is an amenable number.

3405721836 is an abundant number, since it is smaller than the sum of its proper divisors (5562333204).

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

3405721836 is a wasteful number, since it uses less digits than its factorization.

3405721836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889734 (or 889732 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 3405721836 is about 58358.5626622178. The cubic root of 3405721836 is about 1504.5376424700.

Adding to 3405721836 its reverse (6381275043), we get a palindrome (9786996879).

The spelling of 3405721836 in words is "three billion, four hundred five million, seven hundred twenty-one thousand, eight hundred thirty-six".