1309778120 has 32 divisors (see below), whose sum is σ = 3368001600. Its totient is φ = 449066688.

The previous prime is 1309778101. The next prime is 1309778123. The reversal of 1309778120 is 218779031.

It is not an unprimeable number, because it can be changed into a prime (1309778123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2338610 + ... + 2339169.

It is an arithmetic number, because the mean of its divisors is an integer number (105250050).

Almost surely, 2^1309778120 is an apocalyptic number.

1309778120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1309778120 is an abundant number, since it is smaller than the sum of its proper divisors (2058223480).

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

1309778120 is a wasteful number, since it uses less digits than its factorization.

1309778120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4677797 (or 4677793 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 1309778120 is about 36190.8568563940. The cubic root of 1309778120 is about 1094.1224024083.

The spelling of 1309778120 in words is "one billion, three hundred nine million, seven hundred seventy-eight thousand, one hundred twenty".