1291284 has 18 divisors (see below), whose sum is σ = 3264170. Its totient is φ = 430416.

The previous prime is 1291271. The next prime is 1291313. The reversal of 1291284 is 4821921.

It can be written as a sum of positive squares in only one way, i.e., 1258884 + 32400 = 1122^2 + 180^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17899 + ... + 17970.

2^1291284 is an apocalyptic number.

It is an amenable number.

1291284 is an abundant number, since it is smaller than the sum of its proper divisors (1972886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291284 is a wasteful number, since it uses less digits than its factorization.

1291284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35879 (or 35874 counting only the distinct ones).

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

The square root of 1291284 is about 1136.3467780568. The cubic root of 1291284 is about 108.8948288367.

It can be divided in two parts, 12912 and 84, that added together give a square (12996 = 114²).

The spelling of 1291284 in words is "one million, two hundred ninety-one thousand, two hundred eighty-four".