1661296 has 60 divisors (see below), whose sum is σ = 4057032. Its totient is φ = 653184.

The previous prime is 1661293. The next prime is 1661311. The reversal of 1661296 is 6921661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10111 + ... + 10273.

2^1661296 is an apocalyptic number.

1661296 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 1661296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2028516).

1661296 is an abundant number, since it is smaller than the sum of its proper divisors (2395736).

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

1661296 is a wasteful number, since it uses less digits than its factorization.

1661296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 185 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 1661296 is about 1288.9127200862. The cubic root of 1661296 is about 118.4356205219.

The spelling of 1661296 in words is "one million, six hundred sixty-one thousand, two hundred ninety-six".