1284890 has 8 divisors (see below), whose sum is σ = 2312820. Its totient is φ = 513952.

The previous prime is 1284889. The next prime is 1284901. The reversal of 1284890 is 984821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1142761 + 142129 = 1069^2 + 377^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 64235 + ... + 64254.

2^1284890 is an apocalyptic number.

1284890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1284890 is a deficient number, since it is larger than the sum of its proper divisors (1027930).

1284890 is a wasteful number, since it uses less digits than its factorization.

1284890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128496.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1284890 is about 1133.5298849170. The cubic root of 1284890 is about 108.7147946112.

The spelling of 1284890 in words is "one million, two hundred eighty-four thousand, eight hundred ninety".