1328947 has 4 divisors (see below), whose sum is σ = 1334376. Its totient is φ = 1323520.

The previous prime is 1328927. The next prime is 1328953. The reversal of 1328947 is 7498231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7498231 = 13 ⋅576787.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1328947 is a prime.

It is a super-2 number, since 2×1328947² = 3532200257618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328927) 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, 2329 + ... + 2842.

It is an arithmetic number, because the mean of its divisors is an integer number (333594).

2^1328947 is an apocalyptic number.

1328947 is a deficient number, since it is larger than the sum of its proper divisors (5429).

1328947 is an equidigital number, since it uses as much as digits as its factorization.

1328947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5428.

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

The square root of 1328947 is about 1152.7996356696. The cubic root of 1328947 is about 109.9434144227.

The spelling of 1328947 in words is "one million, three hundred twenty-eight thousand, nine hundred forty-seven".