1306421920 has 48 divisors (see below), whose sum is σ = 3092796000. Its totient is φ = 521489664.

The previous prime is 1306421891. The next prime is 1306421927. The reversal of 1306421920 is 291246031.

It is not an unprimeable number, because it can be changed into a prime (1306421927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71659 + ... + 88021.

It is an arithmetic number, because the mean of its divisors is an integer number (64433250).

Almost surely, 2^1306421920 is an apocalyptic number.

1306421920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1306421920 is an abundant number, since it is smaller than the sum of its proper divisors (1786374080).

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

1306421920 is a wasteful number, since it uses less digits than its factorization.

1306421920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16877 (or 16869 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1306421920 is about 36144.4590497631. The cubic root of 1306421920 is about 1093.1870697989.

Adding to 1306421920 its reverse (291246031), we get a palindrome (1597667951).

The spelling of 1306421920 in words is "one billion, three hundred six million, four hundred twenty-one thousand, nine hundred twenty".