1328637 has 4 divisors (see below), whose sum is σ = 1771520. Its totient is φ = 885756.

The previous prime is 1328617. The next prime is 1328647. The reversal of 1328637 is 7368231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1328637 - 2⁶ = 1328573 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328617) 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, 221437 + ... + 221442.

It is an arithmetic number, because the mean of its divisors is an integer number (442880).

2^1328637 is an apocalyptic number.

It is an amenable number.

1328637 is a deficient number, since it is larger than the sum of its proper divisors (442883).

1328637 is an equidigital number, since it uses as much as digits as its factorization.

1328637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442882.

The product of its digits is 6048, while the sum is 30.

The square root of 1328637 is about 1152.6651725458. The cubic root of 1328637 is about 109.9348650201.

It can be divided in two parts, 132863 and 7, that added together give a triangular number (132870 = T₅₁₅).

The spelling of 1328637 in words is "one million, three hundred twenty-eight thousand, six hundred thirty-seven".