1328739 has 8 divisors (see below), whose sum is σ = 1801920. Its totient is φ = 870696.

The previous prime is 1328731. The next prime is 1328741. The reversal of 1328739 is 9378231.

1328739 = 42² + 43² + ... + 159².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1328739 - 2³ = 1328731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1328731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3577 + ... + 3930.

It is an arithmetic number, because the mean of its divisors is an integer number (225240).

2^1328739 is an apocalyptic number.

1328739 is a deficient number, since it is larger than the sum of its proper divisors (473181).

1328739 is an equidigital number, since it uses as much as digits as its factorization.

1328739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7569.

The product of its digits is 9072, while the sum is 33.

The square root of 1328739 is about 1152.7094169824. The cubic root of 1328739 is about 109.9376781961.

The spelling of 1328739 in words is "one million, three hundred twenty-eight thousand, seven hundred thirty-nine".