1309863920 has 40 divisors (see below), whose sum is σ = 3058115280. Its totient is φ = 521763840.

The previous prime is 1309863887. The next prime is 1309863931. The reversal of 1309863920 is 293689031.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14690 + ... + 53249.

It is an arithmetic number, because the mean of its divisors is an integer number (76452882).

Almost surely, 2^1309863920 is an apocalyptic number.

1309863920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1309863920 is an abundant number, since it is smaller than the sum of its proper divisors (1748251360).

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

1309863920 is a wasteful number, since it uses less digits than its factorization.

1309863920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68193 (or 68187 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 1309863920 is about 36192.0422192504. The cubic root of 1309863920 is about 1094.1462928802.

The spelling of 1309863920 in words is "one billion, three hundred nine million, eight hundred sixty-three thousand, nine hundred twenty".