1661284 has 12 divisors (see below), whose sum is σ = 3060400. Its totient is φ = 786888.

The previous prime is 1661281. The next prime is 1661293. The reversal of 1661284 is 4821661.

It is not an unprimeable number, because it can be changed into a prime (1661281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10854 + ... + 11005.

2^1661284 is an apocalyptic number.

It is an amenable number.

1661284 is a deficient number, since it is larger than the sum of its proper divisors (1399116).

1661284 is a wasteful number, since it uses less digits than its factorization.

1661284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21882 (or 21880 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 1661284 is about 1288.9080649914. The cubic root of 1661284 is about 118.4353353568.

The spelling of 1661284 in words is "one million, six hundred sixty-one thousand, two hundred eighty-four".