1661473 has 8 divisors (see below), whose sum is σ = 1827936. Its totient is φ = 1497600.

The previous prime is 1661447. The next prime is 1661479. The reversal of 1661473 is 3741661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661473 - 2⁵ = 1661441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865 + ... + 2017.

It is an arithmetic number, because the mean of its divisors is an integer number (228492).

2^1661473 is an apocalyptic number.

It is an amenable number.

1661473 is a deficient number, since it is larger than the sum of its proper divisors (166463).

1661473 is a wasteful number, since it uses less digits than its factorization.

1661473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295.

The product of its digits is 3024, while the sum is 28.

The square root of 1661473 is about 1288.9813807810. The cubic root of 1661473 is about 118.4398265474.

The spelling of 1661473 in words is "one million, six hundred sixty-one thousand, four hundred seventy-three".