1641320 has 32 divisors (see below), whose sum is σ = 3796200. Its totient is φ = 638208.

The previous prime is 1641301. The next prime is 1641323. The reversal of 1641320 is 231461.

It can be written as a sum of positive squares in 4 ways, for example, as 1170724 + 470596 = 1082^2 + 686^2 .

It is not an unprimeable number, because it can be changed into a prime (1641323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926 + ... + 2034.

2^1641320 is an apocalyptic number.

1641320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1641320 is the 740-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1898100).

1641320 is an abundant number, since it is smaller than the sum of its proper divisors (2154880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1641320 is a wasteful number, since it uses less digits than its factorization.

1641320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1641320 is about 1281.1401172393. The cubic root of 1641320 is about 117.9590013654.

Adding to 1641320 its reverse (231461), we get a palindrome (1872781).

The spelling of 1641320 in words is "one million, six hundred forty-one thousand, three hundred twenty".