1309478220 has 36 divisors (see below), whose sum is σ = 3972084480. Its totient is φ = 349194144.

The previous prime is 1309478207. The next prime is 1309478257. The reversal of 1309478220 is 228749031.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3637260 + ... + 3637619.

It is an arithmetic number, because the mean of its divisors is an integer number (110335680).

Almost surely, 2^1309478220 is an apocalyptic number.

1309478220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1309478220 is an abundant number, since it is smaller than the sum of its proper divisors (2662606260).

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

1309478220 is a wasteful number, since it uses less digits than its factorization.

1309478220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7274894 (or 7274889 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1309478220 is about 36186.7133075111. The cubic root of 1309478220 is about 1094.0388889362.

The spelling of 1309478220 in words is "one billion, three hundred nine million, four hundred seventy-eight thousand, two hundred twenty".