1284861 has 8 divisors (see below), whose sum is σ = 1719360. Its totient is φ = 853472.

The previous prime is 1284851. The next prime is 1284863. The reversal of 1284861 is 1684821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1284861 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284863) 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, 481 + ... + 1673.

It is an arithmetic number, because the mean of its divisors is an integer number (214920).

2^1284861 is an apocalyptic number.

It is an amenable number.

1284861 is a deficient number, since it is larger than the sum of its proper divisors (434499).

1284861 is a wasteful number, since it uses less digits than its factorization.

1284861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555.

The product of its digits is 3072, while the sum is 30.

The square root of 1284861 is about 1133.5170929457. The cubic root of 1284861 is about 108.7139767065.

It can be divided in two parts, 1284 and 861, that added together give a triangular number (2145 = T₆₅).

The spelling of 1284861 in words is "one million, two hundred eighty-four thousand, eight hundred sixty-one".