1309724823 has 16 divisors (see below), whose sum is σ = 1905659136. Its totient is φ = 793520640.

The previous prime is 1309724821. The next prime is 1309724861. The reversal of 1309724823 is 3284279031.

It is not a de Polignac number, because 1309724823 - 2¹ = 1309724821 is a prime.

It is a super-2 number, since 2×1309724823² = 3430758223964762658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309724821) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 203511 + ... + 209847.

It is an arithmetic number, because the mean of its divisors is an integer number (119103696).

Almost surely, 2^1309724823 is an apocalyptic number.

1309724823 is a deficient number, since it is larger than the sum of its proper divisors (595934313).

1309724823 is a wasteful number, since it uses less digits than its factorization.

1309724823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12614.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 1309724823 is about 36190.1205165167. The cubic root of 1309724823 is about 1094.1075616675.

The spelling of 1309724823 in words is "one billion, three hundred nine million, seven hundred twenty-four thousand, eight hundred twenty-three".