1661652 has 36 divisors (see below), whose sum is σ = 4251156. Its totient is φ = 547200.

The previous prime is 1661641. The next prime is 1661659. The reversal of 1661652 is 2561661.

It is a happy number.

1661652 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 652 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1527696 + 133956 = 1236^2 + 366^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1661652² = 5522174738208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3408 + ... + 3864.

2^1661652 is an apocalyptic number.

1661652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1661652 is an abundant number, since it is smaller than the sum of its proper divisors (2589504).

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

1661652 is a wasteful number, since it uses less digits than its factorization.

1661652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 563 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1661652 is about 1289.0508135834. The cubic root of 1661652 is about 118.4440797949. Note that the first 3 decimals are identical.

Subtracting 1661652 from its reverse (2561661), we obtain a palindrome (900009).

The spelling of 1661652 in words is "one million, six hundred sixty-one thousand, six hundred fifty-two".