1641380 has 48 divisors (see below), whose sum is σ = 3810240. Its totient is φ = 590208.

The previous prime is 1641379. The next prime is 1641389. The reversal of 1641380 is 831461.

1641380 = T₄₉₆ + T₄₉₇ + ... + T₅₀₈.

It is not an unprimeable number, because it can be changed into a prime (1641389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15287 + ... + 15393.

It is an arithmetic number, because the mean of its divisors is an integer number (79380).

2^1641380 is an apocalyptic number.

1641380 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 1641380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905120).

1641380 is an abundant number, since it is smaller than the sum of its proper divisors (2168860).

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

1641380 is a wasteful number, since it uses less digits than its factorization.

1641380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1641380 is about 1281.1635336677. The cubic root of 1641380 is about 117.9604387154.

The spelling of 1641380 in words is "one million, six hundred forty-one thousand, three hundred eighty".