1261983 has 8 divisors (see below), whose sum is σ = 1714608. Its totient is φ = 825344.

The previous prime is 1261973. The next prime is 1262011. The reversal of 1261983 is 3891621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261983 - 2²⁰ = 213407 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261913) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3810 + ... + 4127.

It is an arithmetic number, because the mean of its divisors is an integer number (214326).

2^1261983 is an apocalyptic number.

1261983 is a deficient number, since it is larger than the sum of its proper divisors (452625).

1261983 is an equidigital number, since it uses as much as digits as its factorization.

1261983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7993.

The product of its digits is 2592, while the sum is 30.

The square root of 1261983 is about 1123.3801671741. The cubic root of 1261983 is about 108.0648615870.

The spelling of 1261983 in words is "one million, two hundred sixty-one thousand, nine hundred eighty-three".