1328905207 has 4 divisors (see below), whose sum is σ = 1518748816. Its totient is φ = 1139061600.

The previous prime is 1328905187. The next prime is 1328905217. The reversal of 1328905207 is 7025098231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7025098231 = 2729 ⋅2574239.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1328905207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328905217) 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, 94921794 + ... + 94921807.

It is an arithmetic number, because the mean of its divisors is an integer number (379687204).

Almost surely, 2^1328905207 is an apocalyptic number.

1328905207 is a deficient number, since it is larger than the sum of its proper divisors (189843609).

1328905207 is an equidigital number, since it uses as much as digits as its factorization.

1328905207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189843608.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 1328905207 is about 36454.1521229064. The cubic root of 1328905207 is about 1099.4226190291.

The spelling of 1328905207 in words is "one billion, three hundred twenty-eight million, nine hundred five thousand, two hundred seven".