1665456 has 80 divisors (see below), whose sum is σ = 4937184. Its totient is φ = 479232.

The previous prime is 1665451. The next prime is 1665467. The reversal of 1665456 is 6545661.

It is not an unprimeable number, because it can be changed into a prime (1665451) 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, 10530 + ... + 10686.

2^1665456 is an apocalyptic number.

1665456 is a gapful number since it is divisible by the number (16) 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 1665456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2468592).

1665456 is an abundant number, since it is smaller than the sum of its proper divisors (3271728).

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

1665456 is a wasteful number, since it uses less digits than its factorization.

1665456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 192 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 1665456 is about 1290.5254743708. The cubic root of 1665456 is about 118.5343951146.

The spelling of 1665456 in words is "one million, six hundred sixty-five thousand, four hundred fifty-six".