1665380 has 12 divisors (see below), whose sum is σ = 3497340. Its totient is φ = 666144.

The previous prime is 1665343. The next prime is 1665421. The reversal of 1665380 is 835661.

It can be written as a sum of positive squares in 2 ways, for example, as 1183744 + 481636 = 1088^2 + 694^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41615 + ... + 41654.

It is an arithmetic number, because the mean of its divisors is an integer number (291445).

2^1665380 is an apocalyptic number.

1665380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665380 is an abundant number, since it is smaller than the sum of its proper divisors (1831960).

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

1665380 is a wasteful number, since it uses less digits than its factorization.

1665380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83278 (or 83276 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1665380 is about 1290.4960286649. The cubic root of 1665380 is about 118.5325920547.

The spelling of 1665380 in words is "one million, six hundred sixty-five thousand, three hundred eighty".