1291983 has 48 divisors (see below), whose sum is σ = 2363904. Its totient is φ = 618240.

The previous prime is 1291967. The next prime is 1291991. The reversal of 1291983 is 3891921.

It is not a de Polignac number, because 1291983 - 2⁴ = 1291967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291963) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27466 + ... + 27512.

It is an arithmetic number, because the mean of its divisors is an integer number (49248).

2^1291983 is an apocalyptic number.

1291983 is a deficient number, since it is larger than the sum of its proper divisors (1071921).

1291983 is a wasteful number, since it uses less digits than its factorization.

1291983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 85 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 1291983 is about 1136.6543010080. The cubic root of 1291983 is about 108.9144743355.

It can be divided in two parts, 129 and 1983, that added together give a palindrome (2112).

The spelling of 1291983 in words is "one million, two hundred ninety-one thousand, nine hundred eighty-three".