1661148 has 36 divisors (see below), whose sum is σ = 4357080. Its totient is φ = 553392.

The previous prime is 1661141. The next prime is 1661159. The reversal of 1661148 is 8411661.

1661148 is a `hidden beast` number, since 1 + 6 + 611 + 48 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661141) 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, 118 + ... + 1826.

It is an arithmetic number, because the mean of its divisors is an integer number (121030).

2^1661148 is an apocalyptic number.

1661148 is a gapful number since it is divisible by the number (18) 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 1661148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2178540).

1661148 is an abundant number, since it is smaller than the sum of its proper divisors (2695932).

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

1661148 is a wasteful number, since it uses less digits than its factorization.

1661148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728 (or 1714 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1661148 is about 1288.8553060759. The cubic root of 1661148 is about 118.4321033898.

The spelling of 1661148 in words is "one million, six hundred sixty-one thousand, one hundred forty-eight".