1330639 has 4 divisors (see below), whose sum is σ = 1345680. Its totient is φ = 1315600.

The previous prime is 1330633. The next prime is 1330649. The reversal of 1330639 is 9360331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1330639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1330633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7387 + ... + 7564.

It is an arithmetic number, because the mean of its divisors is an integer number (336420).

2^1330639 is an apocalyptic number.

1330639 is a deficient number, since it is larger than the sum of its proper divisors (15041).

1330639 is an equidigital number, since it uses as much as digits as its factorization.

1330639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15040.

The product of its (nonzero) digits is 1458, while the sum is 25.

The square root of 1330639 is about 1153.5332678341. The cubic root of 1330639 is about 109.9900541972.

The spelling of 1330639 in words is "one million, three hundred thirty thousand, six hundred thirty-nine".