1661343 has 8 divisors (see below), whose sum is σ = 2222256. Its totient is φ = 1104000.

The previous prime is 1661333. The next prime is 1661347. The reversal of 1661343 is 3431661.

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

It is not a de Polignac number, because 1661343 - 2⁴ = 1661327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513 + ... + 1893.

It is an arithmetic number, because the mean of its divisors is an integer number (277782).

2^1661343 is an apocalyptic number.

1661343 is a deficient number, since it is larger than the sum of its proper divisors (560913).

1661343 is a wasteful number, since it uses less digits than its factorization.

1661343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785.

The product of its digits is 1296, while the sum is 24.

The square root of 1661343 is about 1288.9309523788. The cubic root of 1661343 is about 118.4367374053.

The spelling of 1661343 in words is "one million, six hundred sixty-one thousand, three hundred forty-three".