1309132438 has 4 divisors (see below), whose sum is σ = 1963698660. Its totient is φ = 654566218.

The previous prime is 1309132421. The next prime is 1309132439. The reversal of 1309132438 is 8342319031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8342319031 = 751 ⋅11108281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309132439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327283108 + ... + 327283111.

It is an arithmetic number, because the mean of its divisors is an integer number (490924665).

Almost surely, 2^1309132438 is an apocalyptic number.

1309132438 is a deficient number, since it is larger than the sum of its proper divisors (654566222).

1309132438 is an equidigital number, since it uses as much as digits as its factorization.

1309132438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654566221.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1309132438 is about 36181.9352439861. The cubic root of 1309132438 is about 1093.9425828268.

The spelling of 1309132438 in words is "one billion, three hundred nine million, one hundred thirty-two thousand, four hundred thirty-eight".