1309921734 has 16 divisors (see below), whose sum is σ = 2858011200. Its totient is φ = 396945960.

The previous prime is 1309921703. The next prime is 1309921763. The reversal of 1309921734 is 4371299031.

It is a junction number, because it is equal to n+sod(n) for n = 1309921692 and 1309921701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9923584 + ... + 9923715.

It is an arithmetic number, because the mean of its divisors is an integer number (178625700).

Almost surely, 2^1309921734 is an apocalyptic number.

1309921734 is an abundant number, since it is smaller than the sum of its proper divisors (1548089466).

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

1309921734 is a wasteful number, since it uses less digits than its factorization.

1309921734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19847315.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 1309921734 is about 36192.8409219282. The cubic root of 1309921734 is about 1094.1623902377.

The spelling of 1309921734 in words is "one billion, three hundred nine million, nine hundred twenty-one thousand, seven hundred thirty-four".