1641280 has 56 divisors (see below), whose sum is σ = 4096512. Its totient is φ = 625152.

The previous prime is 1641253. The next prime is 1641281. The reversal of 1641280 is 821461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7249 + ... + 7471.

It is an arithmetic number, because the mean of its divisors is an integer number (73152).

2^1641280 is an apocalyptic number.

1641280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2048256).

1641280 is an abundant number, since it is smaller than the sum of its proper divisors (2455232).

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

1641280 is a wasteful number, since it uses less digits than its factorization.

1641280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1641280 is about 1281.1245060493. The cubic root of 1641280 is about 117.9580431126.

It can be divided in two parts, 164 and 1280, that added together give a square (1444 = 38²).

The spelling of 1641280 in words is "one million, six hundred forty-one thousand, two hundred eighty".