1328445 has 24 divisors (see below), whose sum is σ = 2350296. Its totient is φ = 693888.

The previous prime is 1328417. The next prime is 1328447. The reversal of 1328445 is 5448231.

It can be written as a sum of positive squares in 4 ways, for example, as 49284 + 1279161 = 222^2 + 1131^2 .

It is not a de Polignac number, because 1328445 - 2⁷ = 1328317 is a prime.

It is a super-2 number, since 2×1328445² = 3529532236050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2107 + ... + 2663.

It is an arithmetic number, because the mean of its divisors is an integer number (97929).

2^1328445 is an apocalyptic number.

1328445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1328445 is a deficient number, since it is larger than the sum of its proper divisors (1021851).

1328445 is a wasteful number, since it uses less digits than its factorization.

1328445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 618 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 1328445 is about 1152.5818842928. The cubic root of 1328445 is about 109.9295692393.

The spelling of 1328445 in words is "one million, three hundred twenty-eight thousand, four hundred forty-five".