1309366620 has 144 divisors (see below), whose sum is σ = 4135098240. Its totient is φ = 347789376.

The previous prime is 1309366603. The next prime is 1309366621. The reversal of 1309366620 is 266639031.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309366621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2036019 + ... + 2036661.

It is an arithmetic number, because the mean of its divisors is an integer number (28715960).

Almost surely, 2^1309366620 is an apocalyptic number.

1309366620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309366620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2067549120).

1309366620 is an abundant number, since it is smaller than the sum of its proper divisors (2825731620).

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

1309366620 is a wasteful number, since it uses less digits than its factorization.

1309366620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086 (or 1072 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 1309366620 is about 36185.1712722214. The cubic root of 1309366620 is about 1094.0078083101.

The spelling of 1309366620 in words is "one billion, three hundred nine million, three hundred sixty-six thousand, six hundred twenty".