1328749 has 2 divisors, whose sum is σ = 1328750. Its totient is φ = 1328748.

The previous prime is 1328741. The next prime is 1328777. The reversal of 1328749 is 9478231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990025 + 338724 = 995^2 + 582^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328749 - 2³ = 1328741 is a prime.

1328749 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664374 + 664375.

It is an arithmetic number, because the mean of its divisors is an integer number (664375).

2^1328749 is an apocalyptic number.

It is an amenable number.

1328749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328749 is an equidigital number, since it uses as much as digits as its factorization.

1328749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 1328749 is about 1152.7137545809. The cubic root of 1328749 is about 109.9379539900.

The spelling of 1328749 in words is "one million, three hundred twenty-eight thousand, seven hundred forty-nine".