1561284 has 36 divisors (see below), whose sum is σ = 4076800. Its totient is φ = 503280.

The previous prime is 1561279. The next prime is 1561303. The reversal of 1561284 is 4821651.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 417 + ... + 1815.

2^1561284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2038400).

1561284 is an abundant number, since it is smaller than the sum of its proper divisors (2515516).

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

1561284 is a wasteful number, since it uses less digits than its factorization.

1561284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440 (or 1435 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1561284 is about 1249.5135053292. The cubic root of 1561284 is about 116.0096107772.

The spelling of 1561284 in words is "one million, five hundred sixty-one thousand, two hundred eighty-four".