1393681329 has 16 divisors (see below), whose sum is σ = 2065299840. Its totient is φ = 928856880.

The previous prime is 1393681309. The next prime is 1393681337. The reversal of 1393681329 is 9231863931.

It is not a de Polignac number, because 1393681329 - 2⁸ = 1393681073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1393681309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153844 + ... + 162650.

It is an arithmetic number, because the mean of its divisors is an integer number (129081240).

Almost surely, 2^1393681329 is an apocalyptic number.

It is an amenable number.

1393681329 is a deficient number, since it is larger than the sum of its proper divisors (671618511).

1393681329 is an equidigital number, since it uses as much as digits as its factorization.

1393681329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14677 (or 14671 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 1393681329 is about 37332.0415862835. The cubic root of 1393681329 is about 1117.0033972038.

The spelling of 1393681329 in words is "one billion, three hundred ninety-three million, six hundred eighty-one thousand, three hundred twenty-nine".