1661748 has 24 divisors (see below), whose sum is σ = 4230240. Its totient is φ = 503520.

The previous prime is 1661741. The next prime is 1661789. The reversal of 1661748 is 8471661.

It is a happy number.

It is a super-2 number, since 2×1661748² = 5522812831008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661741) 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 7 ways as a sum of consecutive naturals, for example, 6163 + ... + 6426.

It is an arithmetic number, because the mean of its divisors is an integer number (176260).

2^1661748 is an apocalyptic number.

It is an amenable number.

1661748 is an abundant number, since it is smaller than the sum of its proper divisors (2568492).

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

1661748 is a wasteful number, since it uses less digits than its factorization.

1661748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12607 (or 12605 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 1661748 is about 1289.0880497468. The cubic root of 1661748 is about 118.4463607404.

The spelling of 1661748 in words is "one million, six hundred sixty-one thousand, seven hundred forty-eight".