3813479820 has 72 divisors (see below), whose sum is σ = 11706969456. Its totient is φ = 1004671872.

The previous prime is 3813479807. The next prime is 3813479837. The reversal of 3813479820 is 289743183.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112687 + ... + 142566.

It is an arithmetic number, because the mean of its divisors is an integer number (162596798).

Almost surely, 2^3813479820 is an apocalyptic number.

3813479820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3813479820 is an abundant number, since it is smaller than the sum of its proper divisors (7893489636).

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

3813479820 is a wasteful number, since it uses less digits than its factorization.

3813479820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255351 (or 255346 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 3813479820 is about 61753.3790168603. The cubic root of 3813479820 is about 1562.3337604045. Note that the first 3 decimals are identical.

The spelling of 3813479820 in words is "three billion, eight hundred thirteen million, four hundred seventy-nine thousand, eight hundred twenty".