1284921 has 12 divisors (see below), whose sum is σ = 2024880. Its totient is φ = 778680.

The previous prime is 1284917. The next prime is 1284931. The reversal of 1284921 is 1294821.

1284921 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 1284921 - 2² = 1284917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1284901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6391 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (168740).

2^1284921 is an apocalyptic number.

1284921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1284921 is a deficient number, since it is larger than the sum of its proper divisors (739959).

1284921 is a wasteful number, since it uses less digits than its factorization.

1284921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12996 (or 12993 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1284921 is about 1133.5435589337. The cubic root of 1284921 is about 108.7156689096.

The spelling of 1284921 in words is "one million, two hundred eighty-four thousand, nine hundred twenty-one".