1261984 has 24 divisors (see below), whose sum is σ = 2513700. Its totient is φ = 623616.

The previous prime is 1261973. The next prime is 1262011. The reversal of 1261984 is 4891621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1210000 + 51984 = 1100^2 + 228^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3442 + ... + 3790.

2^1261984 is an apocalyptic number.

It is an amenable number.

1261984 is a deficient number, since it is larger than the sum of its proper divisors (1251716).

1261984 is a wasteful number, since it uses less digits than its factorization.

1261984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 464 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 1261984 is about 1123.3806122593. The cubic root of 1261984 is about 108.0648901306.

The spelling of 1261984 in words is "one million, two hundred sixty-one thousand, nine hundred eighty-four".