1665412 has 36 divisors (see below), whose sum is σ = 3519180. Its totient is φ = 686784.

The previous prime is 1665343. The next prime is 1665421. The reversal of 1665412 is 2145661.

It can be written as a sum of positive squares in 2 ways, for example, as 1285956 + 379456 = 1134^2 + 616^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5538 + ... + 5830.

It is an arithmetic number, because the mean of its divisors is an integer number (97755).

2^1665412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1759590).

1665412 is an abundant number, since it is smaller than the sum of its proper divisors (1853768).

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

1665412 is a wasteful number, since it uses less digits than its factorization.

1665412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 331 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 1665412 is about 1290.5084269388. The cubic root of 1665412 is about 118.5333512445.

Subtracting 1665412 from its reverse (2145661), we obtain a square (480249 = 693²).

The spelling of 1665412 in words is "one million, six hundred sixty-five thousand, four hundred twelve".