1661455 has 8 divisors (see below), whose sum is σ = 2098800. Its totient is φ = 1259136.

The previous prime is 1661447. The next prime is 1661479. The reversal of 1661455 is 5541661.

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 1661455 - 2³ = 1661447 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 8650 + ... + 8839.

It is an arithmetic number, because the mean of its divisors is an integer number (262350).

2^1661455 is an apocalyptic number.

1661455 is a deficient number, since it is larger than the sum of its proper divisors (437345).

1661455 is a wasteful number, since it uses less digits than its factorization.

1661455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17513.

The product of its digits is 3600, while the sum is 28.

The square root of 1661455 is about 1288.9743985045. The cubic root of 1661455 is about 118.4393988297.

It can be divided in two parts, 1661 and 455, that added together give a square (2116 = 46²).

The spelling of 1661455 in words is "one million, six hundred sixty-one thousand, four hundred fifty-five".