1665534 has 32 divisors (see below), whose sum is σ = 3636864. Its totient is φ = 505440.

The previous prime is 1665533. The next prime is 1665563. The reversal of 1665534 is 4355661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665533) 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, 10137 + ... + 10299.

It is an arithmetic number, because the mean of its divisors is an integer number (113652).

2^1665534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1818432).

1665534 is an abundant number, since it is smaller than the sum of its proper divisors (1971330).

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

1665534 is a wasteful number, since it uses less digits than its factorization.

1665534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its digits is 10800, while the sum is 30.

The square root of 1665534 is about 1290.5556942651. Note that the first 3 decimals coincide. The cubic root of 1665534 is about 118.5362455665.

The spelling of 1665534 in words is "one million, six hundred sixty-five thousand, five hundred thirty-four".